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https://git.busybox.net/busybox.git
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diff: fix -q exit code
last_char_is: sacrifice 9 bytes but avoid double-scan
This commit is contained in:
Denis Vlasenko
parent
79e77cdbed
commit
6a1d661036
142
coreutils/diff.c
142
coreutils/diff.c
@ -50,8 +50,6 @@
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#define D_SKIPPED2 (1<<8)
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/* Command line options */
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static unsigned long cmd_flags;
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#define FLAG_a (1<<0)
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#define FLAG_b (1<<1)
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#define FLAG_d (1<<2)
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@ -68,12 +66,12 @@ static unsigned long cmd_flags;
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#define FLAG_w (1<<13)
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/* XXX: FIXME: the following variables should be static, but gcc currently
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* creates a much bigger object if we do this. */
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* creates a much bigger object if we do this. [which version of gcc? --vda] */
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int context, status;
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char *start, *label[2];
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struct stat stb1, stb2;
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char **dl;
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static int dl_count = 0;
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static int dl_count;
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struct cand {
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int x;
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@ -116,6 +114,7 @@ static struct context_vec *context_vec_start;
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static struct context_vec *context_vec_end;
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static struct context_vec *context_vec_ptr;
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static void print_only(const char *path, size_t dirlen, const char *entry)
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{
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if (dirlen > 1)
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@ -123,6 +122,7 @@ static void print_only(const char *path, size_t dirlen, const char *entry)
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printf("Only in %.*s: %s\n", (int) dirlen, path, entry);
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}
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static void print_status(int val, char *path1, char *path2, char *entry)
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{
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const char *const _entry = entry ? entry : "";
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@ -140,20 +140,20 @@ static void print_status(int val, char *path1, char *path2, char *entry)
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printf("Binary files %s and %s differ\n", _path1, _path2);
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break;
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case D_DIFFER:
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if (cmd_flags & FLAG_q)
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if (option_mask32 & FLAG_q)
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printf("Files %s and %s differ\n", _path1, _path2);
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break;
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case D_SAME:
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if (cmd_flags & FLAG_s)
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if (option_mask32 & FLAG_s)
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printf("Files %s and %s are identical\n", _path1, _path2);
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break;
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case D_MISMATCH1:
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printf("File %s is a directory while file %s is a regular file\n",
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_path1, _path2);
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printf("File %s is a %s while file %s is a %s\n",
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_path1, "directory", _path2, "regular file");
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break;
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case D_MISMATCH2:
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printf("File %s is a regular file while file %s is a directory\n",
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_path1, _path2);
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printf("File %s is a %s while file %s is a %s\n",
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_path1, "regular file", _path2, "directory");
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break;
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case D_SKIPPED1:
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printf("File %s is not a regular file or directory and was skipped\n",
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@ -170,6 +170,7 @@ static void print_status(int val, char *path1, char *path2, char *entry)
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}
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}
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/*
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* Hash function taken from Robert Sedgewick, Algorithms in C, 3d ed., p 578.
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*/
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@ -180,7 +181,7 @@ static int readhash(FILE * f)
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sum = 1;
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space = 0;
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if (!(cmd_flags & FLAG_b) && !(cmd_flags & FLAG_w)) {
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if (!(option_mask32 & FLAG_b) && !(option_mask32 & FLAG_w)) {
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if (FLAG_i)
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for (i = 0; (t = getc(f)) != '\n'; i++) {
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if (t == EOF) {
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@ -209,7 +210,7 @@ static int readhash(FILE * f)
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space++;
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continue;
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default:
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if (space && !(cmd_flags & FLAG_w)) {
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if (space && !(option_mask32 & FLAG_w)) {
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i++;
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space = 0;
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}
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@ -234,22 +235,20 @@ static int readhash(FILE * f)
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}
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/*
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* Check to see if the given files differ.
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* Returns 0 if they are the same, 1 if different, and -1 on error.
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*/
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static int files_differ(FILE * f1, FILE * f2, int flags)
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{
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char buf1[BUFSIZ], buf2[BUFSIZ];
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size_t i, j;
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if ((flags & (D_EMPTY1 | D_EMPTY2)) || stb1.st_size != stb2.st_size ||
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(stb1.st_mode & S_IFMT) != (stb2.st_mode & S_IFMT))
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return 1;
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while (1) {
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i = fread(buf1, 1, sizeof(buf1), f1);
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j = fread(buf2, 1, sizeof(buf2), f2);
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i = fread(bb_common_bufsiz1, 1, BUFSIZ/2, f1);
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j = fread(bb_common_bufsiz1 + BUFSIZ/2, 1, BUFSIZ/2, f2);
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if (i != j)
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return 1;
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if (i == 0 && j == 0) {
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@ -257,11 +256,13 @@ static int files_differ(FILE * f1, FILE * f2, int flags)
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return 1;
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return 0;
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}
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if (memcmp(buf1, buf2, i) != 0)
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if (memcmp(bb_common_bufsiz1,
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bb_common_bufsiz1 + BUFSIZ/2, i) != 0)
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return 1;
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}
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}
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static void prepare(int i, FILE * fd, off_t filesize)
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{
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struct line *p;
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@ -286,6 +287,7 @@ static void prepare(int i, FILE * fd, off_t filesize)
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file[i] = p;
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}
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static void prune(void)
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{
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int i, j;
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@ -303,6 +305,7 @@ static void prune(void)
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}
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}
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static void equiv(struct line *a, int n, struct line *b, int m, int *c)
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{
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int i, j;
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@ -330,6 +333,7 @@ static void equiv(struct line *a, int n, struct line *b, int m, int *c)
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c[j] = -1;
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}
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static int isqrt(int n)
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{
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int y, x = 1;
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@ -347,6 +351,7 @@ static int isqrt(int n)
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return x;
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}
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static int newcand(int x, int y, int pred)
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{
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struct cand *q;
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@ -395,7 +400,7 @@ static int stone(int *a, int n, int *b, int *c)
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#if ENABLE_FEATURE_DIFF_MINIMAL
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const unsigned int bound =
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(cmd_flags & FLAG_d) ? UINT_MAX : MAX(256, isqrt(n));
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(option_mask32 & FLAG_d) ? UINT_MAX : MAX(256, isqrt(n));
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#else
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const unsigned int bound = MAX(256, isqrt(n));
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#endif
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@ -433,6 +438,7 @@ static int stone(int *a, int n, int *b, int *c)
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return k;
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}
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static void unravel(int p)
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{
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struct cand *q;
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@ -457,6 +463,7 @@ static void unsort(struct line *f, int l, int *b)
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free(a);
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}
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static int skipline(FILE * f)
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{
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int i, c;
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@ -493,8 +500,8 @@ static void check(FILE * f1, FILE * f2)
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ixnew[j] = ctnew += skipline(f2);
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j++;
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}
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if ((cmd_flags & FLAG_b) || (cmd_flags & FLAG_w)
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|| (cmd_flags & FLAG_i)) {
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if ((option_mask32 & FLAG_b) || (option_mask32 & FLAG_w)
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|| (option_mask32 & FLAG_i)) {
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while (1) {
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c = getc(f1);
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d = getc(f2);
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@ -502,13 +509,13 @@ static void check(FILE * f1, FILE * f2)
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* GNU diff ignores a missing newline
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* in one file if bflag || wflag.
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*/
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if (((cmd_flags & FLAG_b) || (cmd_flags & FLAG_w)) &&
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if (((option_mask32 & FLAG_b) || (option_mask32 & FLAG_w)) &&
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((c == EOF && d == '\n') || (c == '\n' && d == EOF))) {
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break;
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}
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ctold++;
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ctnew++;
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if ((cmd_flags & FLAG_b) && isspace(c) && isspace(d)) {
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if ((option_mask32 & FLAG_b) && isspace(c) && isspace(d)) {
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do {
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if (c == '\n')
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break;
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@ -519,7 +526,7 @@ static void check(FILE * f1, FILE * f2)
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break;
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ctnew++;
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} while (isspace(d = getc(f2)));
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} else if (cmd_flags & FLAG_w) {
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} else if (option_mask32 & FLAG_w) {
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while (isspace(c) && c != '\n') {
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c = getc(f1);
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ctold++;
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@ -565,6 +572,7 @@ static void check(FILE * f1, FILE * f2)
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ixnew[j] = ctnew += skipline(f2);
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}
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/* shellsort CACM #201 */
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static void sort(struct line *a, int n)
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{
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@ -607,6 +615,7 @@ static void uni_range(int a, int b)
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printf("%d,0", b);
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}
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static int fetch(long *f, int a, int b, FILE * lb, int ch)
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{
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int i, j, c, lastc, col, nc;
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@ -618,7 +627,7 @@ static int fetch(long *f, int a, int b, FILE * lb, int ch)
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nc = f[i] - f[i - 1];
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if (ch != '\0') {
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putchar(ch);
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if (cmd_flags & FLAG_T)
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if (option_mask32 & FLAG_T)
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putchar('\t');
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}
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col = 0;
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@ -627,7 +636,7 @@ static int fetch(long *f, int a, int b, FILE * lb, int ch)
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puts("\n\\ No newline at end of file");
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return 0;
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}
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if (c == '\t' && (cmd_flags & FLAG_t)) {
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if (c == '\t' && (option_mask32 & FLAG_t)) {
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do {
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putchar(' ');
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} while (++col & 7);
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@ -640,21 +649,22 @@ static int fetch(long *f, int a, int b, FILE * lb, int ch)
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return 0;
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}
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static int asciifile(FILE * f)
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{
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#if ENABLE_FEATURE_DIFF_BINARY
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unsigned char buf[BUFSIZ];
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int i, cnt;
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#endif
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if ((cmd_flags & FLAG_a) || f == NULL)
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if ((option_mask32 & FLAG_a) || f == NULL)
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return 1;
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#if ENABLE_FEATURE_DIFF_BINARY
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rewind(f);
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cnt = fread(buf, 1, sizeof(buf), f);
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cnt = fread(bb_common_bufsiz1, 1, BUFSIZ, f);
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for (i = 0; i < cnt; i++) {
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if (!isprint(buf[i]) && !isspace(buf[i])) {
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if (!isprint(bb_common_bufsiz1[i])
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&& !isspace(bb_common_bufsiz1[i])) {
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return 0;
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}
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}
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@ -662,6 +672,7 @@ static int asciifile(FILE * f)
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return 1;
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}
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/* dump accumulated "unified" diff changes */
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static void dump_unified_vec(FILE * f1, FILE * f2)
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{
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@ -735,10 +746,9 @@ static void print_header(const char *file1, const char *file2)
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}
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/*
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* Indicate that there is a difference between lines a and b of the from file
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* to get to lines c to d of the to file. If a is greater then b then there
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* to get to lines c to d of the to file. If a is greater than b then there
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* are no lines in the from file involved and this means that there were
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* lines appended (beginning at b). If c is greater than d then there are
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* lines missing from the to file.
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@ -748,10 +758,10 @@ static void change(char *file1, FILE * f1, char *file2, FILE * f2, int a,
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{
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static size_t max_context = 64;
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if (a > b && c > d)
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return;
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if (cmd_flags & FLAG_q)
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if ((a > b && c > d) || (option_mask32 & FLAG_q)) {
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anychange = 1;
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return;
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}
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/*
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* Allocate change records as needed.
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@ -771,7 +781,6 @@ static void change(char *file1, FILE * f1, char *file2, FILE * f2, int a,
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* Print the context/unidiff header first time through.
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*/
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print_header(file1, file2);
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anychange = 1;
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} else if (a > context_vec_ptr->b + (2 * context) + 1 &&
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c > context_vec_ptr->d + (2 * context) + 1) {
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/*
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@ -785,14 +794,12 @@ static void change(char *file1, FILE * f1, char *file2, FILE * f2, int a,
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context_vec_ptr->b = b;
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context_vec_ptr->c = c;
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context_vec_ptr->d = d;
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return;
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anychange = 1;
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}
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static void output(char *file1, FILE * f1, char *file2, FILE * f2)
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{
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/* Note that j0 and j1 can't be used as they are defined in math.h.
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* This also allows the rather amusing variable 'j00'... */
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int m, i0, i1, j00, j01;
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@ -816,7 +823,7 @@ static void output(char *file1, FILE * f1, char *file2, FILE * f2)
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if (m == 0) {
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change(file1, f1, file2, f2, 1, 0, 1, len[1]);
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}
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if (anychange != 0) {
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if (anychange != 0 && !(option_mask32 & FLAG_q)) {
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dump_unified_vec(f1, f2);
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}
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}
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@ -883,7 +890,6 @@ static void output(char *file1, FILE * f1, char *file2, FILE * f2)
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* 3*(number of k-candidates installed), typically about
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* 6n words for files of length n.
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*/
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static int diffreg(char *ofile1, char *ofile2, int flags)
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{
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char *file1 = ofile1;
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@ -901,25 +907,20 @@ static int diffreg(char *ofile1, char *ofile2, int flags)
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if (strcmp(file1, "-") == 0 && strcmp(file2, "-") == 0)
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goto closem;
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f1 = stdin;
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if (flags & D_EMPTY1)
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f1 = xfopen(bb_dev_null, "r");
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else {
|
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if (strcmp(file1, "-") == 0)
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f1 = stdin;
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else
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f1 = xfopen(file1, "r");
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}
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else if (file1[0] != '-' || file1[1]) /* not "-" */
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f1 = xfopen(file1, "r");
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f2 = stdin;
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if (flags & D_EMPTY2)
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f2 = xfopen(bb_dev_null, "r");
|
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else {
|
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if (strcmp(file2, "-") == 0)
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f2 = stdin;
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else
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f2 = xfopen(file2, "r");
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}
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else if (file2[0] != '-' || file2[1]) /* not "-" */
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f2 = xfopen(file2, "r");
|
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if ((i = files_differ(f1, f2, flags)) == 0)
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i = files_differ(f1, f2, flags);
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if (i == 0)
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goto closem;
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else if (i != 1) { /* 1 == ok */
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/* error */
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@ -965,7 +966,7 @@ static int diffreg(char *ofile1, char *ofile2, int flags)
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check(f1, f2);
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output(file1, f1, file2, f2);
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|
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closem:
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closem:
|
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if (anychange) {
|
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status |= 1;
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if (rval == D_SAME)
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@ -982,10 +983,10 @@ static int diffreg(char *ofile1, char *ofile2, int flags)
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return rval;
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}
|
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|
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|
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#if ENABLE_FEATURE_DIFF_DIR
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static void do_diff(char *dir1, char *path1, char *dir2, char *path2)
|
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{
|
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|
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int flags = D_HEADER;
|
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int val;
|
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|
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@ -1023,14 +1024,15 @@ static void do_diff(char *dir1, char *path1, char *dir2, char *path2)
|
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}
|
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#endif
|
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|
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|
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#if ENABLE_FEATURE_DIFF_DIR
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static int dir_strcmp(const void *p1, const void *p2)
|
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{
|
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return strcmp(*(char *const *) p1, *(char *const *) p2);
|
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}
|
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|
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/* This function adds a filename to dl, the directory listing. */
|
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|
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/* This function adds a filename to dl, the directory listing. */
|
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static int add_to_dirlist(const char *filename,
|
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struct stat ATTRIBUTE_UNUSED * sb, void *userdata,
|
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int depth ATTRIBUTE_UNUSED)
|
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@ -1038,7 +1040,7 @@ static int add_to_dirlist(const char *filename,
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dl_count++;
|
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dl = xrealloc(dl, dl_count * sizeof(char *));
|
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dl[dl_count - 1] = xstrdup(filename);
|
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if (cmd_flags & FLAG_r) {
|
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if (option_mask32 & FLAG_r) {
|
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int *pp = (int *) userdata;
|
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int path_len = *pp + 1;
|
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|
||||
@ -1047,10 +1049,10 @@ static int add_to_dirlist(const char *filename,
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
/* This returns a sorted directory listing. */
|
||||
static char **get_dir(char *path)
|
||||
{
|
||||
|
||||
int i;
|
||||
char **retval;
|
||||
|
||||
@ -1068,7 +1070,7 @@ static char **get_dir(char *path)
|
||||
dl_count = 0;
|
||||
|
||||
/* Now fill dl with a listing. */
|
||||
if (cmd_flags & FLAG_r)
|
||||
if (option_mask32 & FLAG_r)
|
||||
recursive_action(path, TRUE, TRUE, FALSE, add_to_dirlist, NULL,
|
||||
userdata, 0);
|
||||
else {
|
||||
@ -1095,9 +1097,9 @@ static char **get_dir(char *path)
|
||||
return retval;
|
||||
}
|
||||
|
||||
|
||||
static void diffdir(char *p1, char *p2)
|
||||
{
|
||||
|
||||
char **dirlist1, **dirlist2;
|
||||
char *dp1, *dp2;
|
||||
int dirlist1_count, dirlist2_count;
|
||||
@ -1144,13 +1146,13 @@ static void diffdir(char *p1, char *p2)
|
||||
dirlist1++;
|
||||
dirlist2++;
|
||||
} else if (pos < 0) {
|
||||
if (cmd_flags & FLAG_N)
|
||||
if (option_mask32 & FLAG_N)
|
||||
do_diff(p1, dp1, p2, NULL);
|
||||
else
|
||||
print_only(p1, strlen(p1) + 1, dp1);
|
||||
dirlist1++;
|
||||
} else {
|
||||
if (cmd_flags & FLAG_N)
|
||||
if (option_mask32 & FLAG_N)
|
||||
do_diff(p1, NULL, p2, dp2);
|
||||
else
|
||||
print_only(p2, strlen(p2) + 1, dp2);
|
||||
@ -1161,7 +1163,6 @@ static void diffdir(char *p1, char *p2)
|
||||
#endif
|
||||
|
||||
|
||||
|
||||
int diff_main(int argc, char **argv)
|
||||
{
|
||||
int gotstdin = 0;
|
||||
@ -1170,10 +1171,11 @@ int diff_main(int argc, char **argv)
|
||||
llist_t *L_arg = NULL;
|
||||
|
||||
opt_complementary = "L::";
|
||||
cmd_flags = getopt32(argc, argv, "abdiL:NqrsS:tTU:wu",
|
||||
getopt32(argc, argv, "abdiL:NqrsS:tTU:wu"
|
||||
"p" /* ignored (for compatibility) */,
|
||||
&L_arg, &start, &U_opt);
|
||||
|
||||
if (cmd_flags & FLAG_L) {
|
||||
if (option_mask32 & FLAG_L) {
|
||||
while (L_arg) {
|
||||
if (label[0] == NULL)
|
||||
label[0] = L_arg->data;
|
||||
@ -1196,8 +1198,8 @@ int diff_main(int argc, char **argv)
|
||||
}
|
||||
|
||||
context = 3; /* This is the default number of lines of context. */
|
||||
if (cmd_flags & FLAG_U) {
|
||||
context = xatoul_range(U_opt, 1, INT_MAX);
|
||||
if (option_mask32 & FLAG_U) {
|
||||
context = xatou_range(U_opt, 1, INT_MAX);
|
||||
}
|
||||
argc -= optind;
|
||||
argv += optind;
|
||||
@ -1210,12 +1212,12 @@ int diff_main(int argc, char **argv)
|
||||
bb_error_msg("missing filename");
|
||||
bb_show_usage();
|
||||
}
|
||||
if (strcmp(argv[0], "-") == 0) {
|
||||
if (argv[0][0] == '-' && !argv[0][1]) { /* "-" */
|
||||
fstat(STDIN_FILENO, &stb1);
|
||||
gotstdin = 1;
|
||||
} else
|
||||
xstat(argv[0], &stb1);
|
||||
if (strcmp(argv[1], "-") == 0) {
|
||||
if (argv[1][0] == '-' && !argv[1][1]) { /* "-" */
|
||||
fstat(STDIN_FILENO, &stb2);
|
||||
gotstdin = 1;
|
||||
} else
|
||||
@ -1239,5 +1241,5 @@ int diff_main(int argc, char **argv)
|
||||
}
|
||||
print_status(diffreg(argv[0], argv[1], 0), argv[0], argv[1], NULL);
|
||||
}
|
||||
exit(status);
|
||||
return status;
|
||||
}
|
||||
|
||||
@ -9,15 +9,15 @@
|
||||
|
||||
#include "libbb.h"
|
||||
|
||||
/* Find out if the last character of a string matches the one given Don't
|
||||
* underrun the buffer if the string length is 0. Also avoids a possible
|
||||
* space-hogging inline of strlen() per usage.
|
||||
/* Find out if the last character of a string matches the one given.
|
||||
* Don't underrun the buffer if the string length is 0.
|
||||
*/
|
||||
char* last_char_is(const char *s, int c)
|
||||
{
|
||||
if (s) {
|
||||
s = strrchr(s, c);
|
||||
if (s && !s[1])
|
||||
if (s && *s) {
|
||||
size_t sz = strlen(s) - 1;
|
||||
s += sz;
|
||||
if ( (unsigned char)*s == c)
|
||||
return (char*)s;
|
||||
}
|
||||
return NULL;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user