mirror of
https://github.com/git/git.git
synced 2024-11-24 18:33:43 +08:00
11529ecec9
Update various codepaths to avoid manually-counted malloc().
* jk/tighten-alloc: (22 commits)
ewah: convert to REALLOC_ARRAY, etc
convert ewah/bitmap code to use xmalloc
diff_populate_gitlink: use a strbuf
transport_anonymize_url: use xstrfmt
git-compat-util: drop mempcpy compat code
sequencer: simplify memory allocation of get_message
test-path-utils: fix normalize_path_copy output buffer size
fetch-pack: simplify add_sought_entry
fast-import: simplify allocation in start_packfile
write_untracked_extension: use FLEX_ALLOC helper
prepare_{git,shell}_cmd: use argv_array
use st_add and st_mult for allocation size computation
convert trivial cases to FLEX_ARRAY macros
use xmallocz to avoid size arithmetic
convert trivial cases to ALLOC_ARRAY
convert manual allocations to argv_array
argv-array: add detach function
add helpers for allocating flex-array structs
harden REALLOC_ARRAY and xcalloc against size_t overflow
tree-diff: catch integer overflow in combine_diff_path allocation
...
854 lines
18 KiB
C
854 lines
18 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "utf8.h"
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int starts_with(const char *str, const char *prefix)
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{
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for (; ; str++, prefix++)
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if (!*prefix)
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return 1;
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else if (*str != *prefix)
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return 0;
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}
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/*
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* Used as the default ->buf value, so that people can always assume
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* buf is non NULL and ->buf is NUL terminated even for a freshly
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* initialized strbuf.
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*/
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char strbuf_slopbuf[1];
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void strbuf_init(struct strbuf *sb, size_t hint)
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{
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sb->alloc = sb->len = 0;
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sb->buf = strbuf_slopbuf;
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if (hint)
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strbuf_grow(sb, hint);
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}
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void strbuf_release(struct strbuf *sb)
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{
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if (sb->alloc) {
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free(sb->buf);
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strbuf_init(sb, 0);
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}
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}
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char *strbuf_detach(struct strbuf *sb, size_t *sz)
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{
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char *res;
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strbuf_grow(sb, 0);
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res = sb->buf;
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if (sz)
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*sz = sb->len;
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strbuf_init(sb, 0);
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return res;
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}
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void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
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{
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strbuf_release(sb);
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sb->buf = buf;
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sb->len = len;
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sb->alloc = alloc;
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strbuf_grow(sb, 0);
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sb->buf[sb->len] = '\0';
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}
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void strbuf_grow(struct strbuf *sb, size_t extra)
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{
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int new_buf = !sb->alloc;
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if (unsigned_add_overflows(extra, 1) ||
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unsigned_add_overflows(sb->len, extra + 1))
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die("you want to use way too much memory");
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if (new_buf)
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sb->buf = NULL;
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ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
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if (new_buf)
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sb->buf[0] = '\0';
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}
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void strbuf_trim(struct strbuf *sb)
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{
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strbuf_rtrim(sb);
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strbuf_ltrim(sb);
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}
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void strbuf_rtrim(struct strbuf *sb)
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{
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while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
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sb->len--;
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sb->buf[sb->len] = '\0';
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}
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void strbuf_ltrim(struct strbuf *sb)
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{
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char *b = sb->buf;
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while (sb->len > 0 && isspace(*b)) {
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b++;
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sb->len--;
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}
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memmove(sb->buf, b, sb->len);
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sb->buf[sb->len] = '\0';
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}
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int strbuf_reencode(struct strbuf *sb, const char *from, const char *to)
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{
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char *out;
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int len;
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if (same_encoding(from, to))
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return 0;
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out = reencode_string_len(sb->buf, sb->len, to, from, &len);
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if (!out)
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return -1;
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strbuf_attach(sb, out, len, len);
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return 0;
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}
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void strbuf_tolower(struct strbuf *sb)
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{
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char *p = sb->buf, *end = sb->buf + sb->len;
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for (; p < end; p++)
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*p = tolower(*p);
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}
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struct strbuf **strbuf_split_buf(const char *str, size_t slen,
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int terminator, int max)
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{
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struct strbuf **ret = NULL;
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size_t nr = 0, alloc = 0;
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struct strbuf *t;
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while (slen) {
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int len = slen;
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if (max <= 0 || nr + 1 < max) {
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const char *end = memchr(str, terminator, slen);
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if (end)
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len = end - str + 1;
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}
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t = xmalloc(sizeof(struct strbuf));
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strbuf_init(t, len);
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strbuf_add(t, str, len);
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ALLOC_GROW(ret, nr + 2, alloc);
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ret[nr++] = t;
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str += len;
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slen -= len;
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}
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ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
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ret[nr] = NULL;
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return ret;
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}
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void strbuf_list_free(struct strbuf **sbs)
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{
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struct strbuf **s = sbs;
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while (*s) {
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strbuf_release(*s);
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free(*s++);
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}
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free(sbs);
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}
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int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
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{
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int len = a->len < b->len ? a->len: b->len;
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int cmp = memcmp(a->buf, b->buf, len);
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if (cmp)
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return cmp;
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return a->len < b->len ? -1: a->len != b->len;
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}
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void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
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const void *data, size_t dlen)
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{
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if (unsigned_add_overflows(pos, len))
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die("you want to use way too much memory");
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if (pos > sb->len)
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die("`pos' is too far after the end of the buffer");
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if (pos + len > sb->len)
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die("`pos + len' is too far after the end of the buffer");
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if (dlen >= len)
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strbuf_grow(sb, dlen - len);
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memmove(sb->buf + pos + dlen,
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sb->buf + pos + len,
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sb->len - pos - len);
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memcpy(sb->buf + pos, data, dlen);
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strbuf_setlen(sb, sb->len + dlen - len);
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}
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void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
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{
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strbuf_splice(sb, pos, 0, data, len);
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}
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void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
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{
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strbuf_splice(sb, pos, len, NULL, 0);
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}
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void strbuf_add(struct strbuf *sb, const void *data, size_t len)
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{
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strbuf_grow(sb, len);
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memcpy(sb->buf + sb->len, data, len);
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strbuf_setlen(sb, sb->len + len);
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}
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void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
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{
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strbuf_grow(sb, len);
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memcpy(sb->buf + sb->len, sb->buf + pos, len);
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strbuf_setlen(sb, sb->len + len);
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}
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void strbuf_addchars(struct strbuf *sb, int c, size_t n)
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{
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strbuf_grow(sb, n);
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memset(sb->buf + sb->len, c, n);
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strbuf_setlen(sb, sb->len + n);
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}
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void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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strbuf_vaddf(sb, fmt, ap);
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va_end(ap);
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}
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static void add_lines(struct strbuf *out,
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const char *prefix1,
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const char *prefix2,
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const char *buf, size_t size)
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{
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while (size) {
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const char *prefix;
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const char *next = memchr(buf, '\n', size);
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next = next ? (next + 1) : (buf + size);
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prefix = ((prefix2 && (buf[0] == '\n' || buf[0] == '\t'))
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? prefix2 : prefix1);
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strbuf_addstr(out, prefix);
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strbuf_add(out, buf, next - buf);
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size -= next - buf;
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buf = next;
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}
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strbuf_complete_line(out);
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}
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void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size)
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{
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static char prefix1[3];
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static char prefix2[2];
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if (prefix1[0] != comment_line_char) {
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xsnprintf(prefix1, sizeof(prefix1), "%c ", comment_line_char);
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xsnprintf(prefix2, sizeof(prefix2), "%c", comment_line_char);
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}
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add_lines(out, prefix1, prefix2, buf, size);
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}
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void strbuf_commented_addf(struct strbuf *sb, const char *fmt, ...)
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{
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va_list params;
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struct strbuf buf = STRBUF_INIT;
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int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
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va_start(params, fmt);
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strbuf_vaddf(&buf, fmt, params);
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va_end(params);
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strbuf_add_commented_lines(sb, buf.buf, buf.len);
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if (incomplete_line)
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sb->buf[--sb->len] = '\0';
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strbuf_release(&buf);
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}
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void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
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{
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int len;
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va_list cp;
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if (!strbuf_avail(sb))
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strbuf_grow(sb, 64);
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va_copy(cp, ap);
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len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
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va_end(cp);
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if (len < 0)
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die("BUG: your vsnprintf is broken (returned %d)", len);
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if (len > strbuf_avail(sb)) {
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strbuf_grow(sb, len);
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len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
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if (len > strbuf_avail(sb))
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die("BUG: your vsnprintf is broken (insatiable)");
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}
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strbuf_setlen(sb, sb->len + len);
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}
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void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
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void *context)
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{
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for (;;) {
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const char *percent;
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size_t consumed;
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percent = strchrnul(format, '%');
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strbuf_add(sb, format, percent - format);
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if (!*percent)
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break;
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format = percent + 1;
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if (*format == '%') {
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strbuf_addch(sb, '%');
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format++;
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continue;
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}
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consumed = fn(sb, format, context);
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if (consumed)
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format += consumed;
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else
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strbuf_addch(sb, '%');
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}
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}
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size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
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void *context)
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{
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struct strbuf_expand_dict_entry *e = context;
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size_t len;
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for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
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if (!strncmp(placeholder, e->placeholder, len)) {
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if (e->value)
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strbuf_addstr(sb, e->value);
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return len;
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}
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}
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return 0;
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}
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void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
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{
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int i, len = src->len;
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for (i = 0; i < len; i++) {
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if (src->buf[i] == '%')
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strbuf_addch(dst, '%');
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strbuf_addch(dst, src->buf[i]);
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}
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}
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size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
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{
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size_t res;
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size_t oldalloc = sb->alloc;
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strbuf_grow(sb, size);
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res = fread(sb->buf + sb->len, 1, size, f);
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if (res > 0)
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strbuf_setlen(sb, sb->len + res);
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else if (oldalloc == 0)
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strbuf_release(sb);
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return res;
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}
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ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
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{
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size_t oldlen = sb->len;
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size_t oldalloc = sb->alloc;
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strbuf_grow(sb, hint ? hint : 8192);
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for (;;) {
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ssize_t want = sb->alloc - sb->len - 1;
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ssize_t got = read_in_full(fd, sb->buf + sb->len, want);
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if (got < 0) {
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if (oldalloc == 0)
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strbuf_release(sb);
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else
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strbuf_setlen(sb, oldlen);
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return -1;
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}
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sb->len += got;
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if (got < want)
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break;
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strbuf_grow(sb, 8192);
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}
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sb->buf[sb->len] = '\0';
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return sb->len - oldlen;
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}
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ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
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{
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ssize_t cnt;
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strbuf_grow(sb, hint ? hint : 8192);
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cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
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if (cnt > 0)
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strbuf_setlen(sb, sb->len + cnt);
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return cnt;
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}
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#define STRBUF_MAXLINK (2*PATH_MAX)
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int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
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{
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size_t oldalloc = sb->alloc;
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if (hint < 32)
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hint = 32;
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while (hint < STRBUF_MAXLINK) {
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int len;
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strbuf_grow(sb, hint);
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len = readlink(path, sb->buf, hint);
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if (len < 0) {
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if (errno != ERANGE)
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break;
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} else if (len < hint) {
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strbuf_setlen(sb, len);
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return 0;
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}
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/* .. the buffer was too small - try again */
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hint *= 2;
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}
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if (oldalloc == 0)
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strbuf_release(sb);
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return -1;
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}
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int strbuf_getcwd(struct strbuf *sb)
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{
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size_t oldalloc = sb->alloc;
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size_t guessed_len = 128;
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for (;; guessed_len *= 2) {
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strbuf_grow(sb, guessed_len);
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if (getcwd(sb->buf, sb->alloc)) {
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strbuf_setlen(sb, strlen(sb->buf));
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return 0;
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}
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if (errno != ERANGE)
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break;
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}
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if (oldalloc == 0)
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strbuf_release(sb);
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else
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strbuf_reset(sb);
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return -1;
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}
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#ifdef HAVE_GETDELIM
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int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
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{
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ssize_t r;
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if (feof(fp))
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return EOF;
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strbuf_reset(sb);
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/* Translate slopbuf to NULL, as we cannot call realloc on it */
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if (!sb->alloc)
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sb->buf = NULL;
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r = getdelim(&sb->buf, &sb->alloc, term, fp);
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if (r > 0) {
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sb->len = r;
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return 0;
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}
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assert(r == -1);
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/*
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* Normally we would have called xrealloc, which will try to free
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* memory and recover. But we have no way to tell getdelim() to do so.
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* Worse, we cannot try to recover ENOMEM ourselves, because we have
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* no idea how many bytes were read by getdelim.
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*
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* Dying here is reasonable. It mirrors what xrealloc would do on
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* catastrophic memory failure. We skip the opportunity to free pack
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* memory and retry, but that's unlikely to help for a malloc small
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* enough to hold a single line of input, anyway.
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*/
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if (errno == ENOMEM)
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die("Out of memory, getdelim failed");
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/* Restore slopbuf that we moved out of the way before */
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if (!sb->buf)
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strbuf_init(sb, 0);
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return EOF;
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}
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#else
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int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
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{
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int ch;
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if (feof(fp))
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return EOF;
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strbuf_reset(sb);
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flockfile(fp);
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while ((ch = getc_unlocked(fp)) != EOF) {
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if (!strbuf_avail(sb))
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strbuf_grow(sb, 1);
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sb->buf[sb->len++] = ch;
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if (ch == term)
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break;
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}
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funlockfile(fp);
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if (ch == EOF && sb->len == 0)
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return EOF;
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sb->buf[sb->len] = '\0';
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return 0;
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}
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#endif
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static int strbuf_getdelim(struct strbuf *sb, FILE *fp, int term)
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{
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if (strbuf_getwholeline(sb, fp, term))
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return EOF;
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if (sb->buf[sb->len - 1] == term)
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strbuf_setlen(sb, sb->len - 1);
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return 0;
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}
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int strbuf_getline(struct strbuf *sb, FILE *fp)
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{
|
|
if (strbuf_getwholeline(sb, fp, '\n'))
|
|
return EOF;
|
|
if (sb->buf[sb->len - 1] == '\n') {
|
|
strbuf_setlen(sb, sb->len - 1);
|
|
if (sb->len && sb->buf[sb->len - 1] == '\r')
|
|
strbuf_setlen(sb, sb->len - 1);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
|
|
{
|
|
return strbuf_getdelim(sb, fp, '\n');
|
|
}
|
|
|
|
int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
|
|
{
|
|
return strbuf_getdelim(sb, fp, '\0');
|
|
}
|
|
|
|
int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
|
|
{
|
|
strbuf_reset(sb);
|
|
|
|
while (1) {
|
|
char ch;
|
|
ssize_t len = xread(fd, &ch, 1);
|
|
if (len <= 0)
|
|
return EOF;
|
|
strbuf_addch(sb, ch);
|
|
if (ch == term)
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
|
|
{
|
|
int fd;
|
|
ssize_t len;
|
|
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0)
|
|
return -1;
|
|
len = strbuf_read(sb, fd, hint);
|
|
close(fd);
|
|
if (len < 0)
|
|
return -1;
|
|
|
|
return len;
|
|
}
|
|
|
|
void strbuf_add_lines(struct strbuf *out, const char *prefix,
|
|
const char *buf, size_t size)
|
|
{
|
|
add_lines(out, prefix, NULL, buf, size);
|
|
}
|
|
|
|
void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
|
|
{
|
|
while (*s) {
|
|
size_t len = strcspn(s, "\"<>&");
|
|
strbuf_add(buf, s, len);
|
|
s += len;
|
|
switch (*s) {
|
|
case '"':
|
|
strbuf_addstr(buf, """);
|
|
break;
|
|
case '<':
|
|
strbuf_addstr(buf, "<");
|
|
break;
|
|
case '>':
|
|
strbuf_addstr(buf, ">");
|
|
break;
|
|
case '&':
|
|
strbuf_addstr(buf, "&");
|
|
break;
|
|
case 0:
|
|
return;
|
|
}
|
|
s++;
|
|
}
|
|
}
|
|
|
|
static int is_rfc3986_reserved(char ch)
|
|
{
|
|
switch (ch) {
|
|
case '!': case '*': case '\'': case '(': case ')': case ';':
|
|
case ':': case '@': case '&': case '=': case '+': case '$':
|
|
case ',': case '/': case '?': case '#': case '[': case ']':
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int is_rfc3986_unreserved(char ch)
|
|
{
|
|
return isalnum(ch) ||
|
|
ch == '-' || ch == '_' || ch == '.' || ch == '~';
|
|
}
|
|
|
|
static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
|
|
int reserved)
|
|
{
|
|
strbuf_grow(sb, len);
|
|
while (len--) {
|
|
char ch = *s++;
|
|
if (is_rfc3986_unreserved(ch) ||
|
|
(!reserved && is_rfc3986_reserved(ch)))
|
|
strbuf_addch(sb, ch);
|
|
else
|
|
strbuf_addf(sb, "%%%02x", ch);
|
|
}
|
|
}
|
|
|
|
void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
|
|
int reserved)
|
|
{
|
|
strbuf_add_urlencode(sb, s, strlen(s), reserved);
|
|
}
|
|
|
|
void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
|
|
{
|
|
if (bytes > 1 << 30) {
|
|
strbuf_addf(buf, "%u.%2.2u GiB",
|
|
(int)(bytes >> 30),
|
|
(int)(bytes & ((1 << 30) - 1)) / 10737419);
|
|
} else if (bytes > 1 << 20) {
|
|
int x = bytes + 5243; /* for rounding */
|
|
strbuf_addf(buf, "%u.%2.2u MiB",
|
|
x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
|
|
} else if (bytes > 1 << 10) {
|
|
int x = bytes + 5; /* for rounding */
|
|
strbuf_addf(buf, "%u.%2.2u KiB",
|
|
x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
|
|
} else {
|
|
strbuf_addf(buf, "%u bytes", (int)bytes);
|
|
}
|
|
}
|
|
|
|
void strbuf_add_absolute_path(struct strbuf *sb, const char *path)
|
|
{
|
|
if (!*path)
|
|
die("The empty string is not a valid path");
|
|
if (!is_absolute_path(path)) {
|
|
struct stat cwd_stat, pwd_stat;
|
|
size_t orig_len = sb->len;
|
|
char *cwd = xgetcwd();
|
|
char *pwd = getenv("PWD");
|
|
if (pwd && strcmp(pwd, cwd) &&
|
|
!stat(cwd, &cwd_stat) &&
|
|
(cwd_stat.st_dev || cwd_stat.st_ino) &&
|
|
!stat(pwd, &pwd_stat) &&
|
|
pwd_stat.st_dev == cwd_stat.st_dev &&
|
|
pwd_stat.st_ino == cwd_stat.st_ino)
|
|
strbuf_addstr(sb, pwd);
|
|
else
|
|
strbuf_addstr(sb, cwd);
|
|
if (sb->len > orig_len && !is_dir_sep(sb->buf[sb->len - 1]))
|
|
strbuf_addch(sb, '/');
|
|
free(cwd);
|
|
}
|
|
strbuf_addstr(sb, path);
|
|
}
|
|
|
|
int printf_ln(const char *fmt, ...)
|
|
{
|
|
int ret;
|
|
va_list ap;
|
|
va_start(ap, fmt);
|
|
ret = vprintf(fmt, ap);
|
|
va_end(ap);
|
|
if (ret < 0 || putchar('\n') == EOF)
|
|
return -1;
|
|
return ret + 1;
|
|
}
|
|
|
|
int fprintf_ln(FILE *fp, const char *fmt, ...)
|
|
{
|
|
int ret;
|
|
va_list ap;
|
|
va_start(ap, fmt);
|
|
ret = vfprintf(fp, fmt, ap);
|
|
va_end(ap);
|
|
if (ret < 0 || putc('\n', fp) == EOF)
|
|
return -1;
|
|
return ret + 1;
|
|
}
|
|
|
|
char *xstrdup_tolower(const char *string)
|
|
{
|
|
char *result;
|
|
size_t len, i;
|
|
|
|
len = strlen(string);
|
|
result = xmallocz(len);
|
|
for (i = 0; i < len; i++)
|
|
result[i] = tolower(string[i]);
|
|
result[i] = '\0';
|
|
return result;
|
|
}
|
|
|
|
char *xstrvfmt(const char *fmt, va_list ap)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
strbuf_vaddf(&buf, fmt, ap);
|
|
return strbuf_detach(&buf, NULL);
|
|
}
|
|
|
|
char *xstrfmt(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
char *ret;
|
|
|
|
va_start(ap, fmt);
|
|
ret = xstrvfmt(fmt, ap);
|
|
va_end(ap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm)
|
|
{
|
|
size_t hint = 128;
|
|
size_t len;
|
|
|
|
if (!*fmt)
|
|
return;
|
|
|
|
strbuf_grow(sb, hint);
|
|
len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
|
|
|
|
if (!len) {
|
|
/*
|
|
* strftime reports "0" if it could not fit the result in the buffer.
|
|
* Unfortunately, it also reports "0" if the requested time string
|
|
* takes 0 bytes. So our strategy is to munge the format so that the
|
|
* output contains at least one character, and then drop the extra
|
|
* character before returning.
|
|
*/
|
|
struct strbuf munged_fmt = STRBUF_INIT;
|
|
strbuf_addf(&munged_fmt, "%s ", fmt);
|
|
while (!len) {
|
|
hint *= 2;
|
|
strbuf_grow(sb, hint);
|
|
len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
|
|
munged_fmt.buf, tm);
|
|
}
|
|
strbuf_release(&munged_fmt);
|
|
len--; /* drop munged space */
|
|
}
|
|
strbuf_setlen(sb, sb->len + len);
|
|
}
|
|
|
|
void strbuf_add_unique_abbrev(struct strbuf *sb, const unsigned char *sha1,
|
|
int abbrev_len)
|
|
{
|
|
int r;
|
|
strbuf_grow(sb, GIT_SHA1_HEXSZ + 1);
|
|
r = find_unique_abbrev_r(sb->buf + sb->len, sha1, abbrev_len);
|
|
strbuf_setlen(sb, sb->len + r);
|
|
}
|
|
|
|
/*
|
|
* Returns the length of a line, without trailing spaces.
|
|
*
|
|
* If the line ends with newline, it will be removed too.
|
|
*/
|
|
static size_t cleanup(char *line, size_t len)
|
|
{
|
|
while (len) {
|
|
unsigned char c = line[len - 1];
|
|
if (!isspace(c))
|
|
break;
|
|
len--;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Remove empty lines from the beginning and end
|
|
* and also trailing spaces from every line.
|
|
*
|
|
* Turn multiple consecutive empty lines between paragraphs
|
|
* into just one empty line.
|
|
*
|
|
* If the input has only empty lines and spaces,
|
|
* no output will be produced.
|
|
*
|
|
* If last line does not have a newline at the end, one is added.
|
|
*
|
|
* Enable skip_comments to skip every line starting with comment
|
|
* character.
|
|
*/
|
|
void strbuf_stripspace(struct strbuf *sb, int skip_comments)
|
|
{
|
|
int empties = 0;
|
|
size_t i, j, len, newlen;
|
|
char *eol;
|
|
|
|
/* We may have to add a newline. */
|
|
strbuf_grow(sb, 1);
|
|
|
|
for (i = j = 0; i < sb->len; i += len, j += newlen) {
|
|
eol = memchr(sb->buf + i, '\n', sb->len - i);
|
|
len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
|
|
|
|
if (skip_comments && len && sb->buf[i] == comment_line_char) {
|
|
newlen = 0;
|
|
continue;
|
|
}
|
|
newlen = cleanup(sb->buf + i, len);
|
|
|
|
/* Not just an empty line? */
|
|
if (newlen) {
|
|
if (empties > 0 && j > 0)
|
|
sb->buf[j++] = '\n';
|
|
empties = 0;
|
|
memmove(sb->buf + j, sb->buf + i, newlen);
|
|
sb->buf[newlen + j++] = '\n';
|
|
} else {
|
|
empties++;
|
|
}
|
|
}
|
|
|
|
strbuf_setlen(sb, j);
|
|
}
|