From 0971e992c4e2806b427a09239ee48a90280c9b15 Mon Sep 17 00:00:00 2001 From: Ben Walton Date: Sun, 30 Sep 2012 20:44:36 +0100 Subject: [PATCH] Remove the hard coded length limit on variable names in config files Previously while reading the variable names in config files, there was a 256 character limit with at most 128 of those characters being used by the section header portion of the variable name. This limitation was only enforced while reading the config files. It was possible to write a config file that was not subsequently readable. Instead of enforcing this limitation for both reading and writing, remove it entirely by changing the var member of the config_file struct to a strbuf instead of a fixed length buffer. Update all of the parsing functions in config.c to use the strbuf instead of the static buffer. The parsing functions that returned the base length of the variable name now return simply 0 for success and -1 for failure. The base length information is obtained through the strbuf's len member. We now send the buf member of the strbuf to external callback functions to preserve the external api. None of the external callers rely on the old size limitation for sizing their own buffers so removing the limit should have no externally visible effect. Signed-off-by: Ben Walton Signed-off-by: Junio C Hamano --- config.c | 59 ++++++++++++++++++++++++++++---------------------------- 1 file changed, 29 insertions(+), 30 deletions(-) diff --git a/config.c b/config.c index 08e47e2e48..fff8a43bc0 100644 --- a/config.c +++ b/config.c @@ -10,8 +10,6 @@ #include "strbuf.h" #include "quote.h" -#define MAXNAME (256) - typedef struct config_file { struct config_file *prev; FILE *f; @@ -19,7 +17,7 @@ typedef struct config_file { int linenr; int eof; struct strbuf value; - char var[MAXNAME]; + struct strbuf var; } config_file; static config_file *cf; @@ -260,7 +258,7 @@ static inline int iskeychar(int c) return isalnum(c) || c == '-'; } -static int get_value(config_fn_t fn, void *data, char *name, unsigned int len) +static int get_value(config_fn_t fn, void *data, struct strbuf *name) { int c; char *value; @@ -272,11 +270,9 @@ static int get_value(config_fn_t fn, void *data, char *name, unsigned int len) break; if (!iskeychar(c)) break; - name[len++] = tolower(c); - if (len >= MAXNAME) - return -1; + strbuf_addch(name, tolower(c)); } - name[len] = 0; + while (c == ' ' || c == '\t') c = get_next_char(); @@ -288,10 +284,10 @@ static int get_value(config_fn_t fn, void *data, char *name, unsigned int len) if (!value) return -1; } - return fn(name, value, data); + return fn(name->buf, value, data); } -static int get_extended_base_var(char *name, int baselen, int c) +static int get_extended_base_var(struct strbuf *name, int c) { do { if (c == '\n') @@ -302,7 +298,7 @@ static int get_extended_base_var(char *name, int baselen, int c) /* We require the format to be '[base "extension"]' */ if (c != '"') return -1; - name[baselen++] = '.'; + strbuf_addch(name, '.'); for (;;) { int c = get_next_char(); @@ -315,37 +311,31 @@ static int get_extended_base_var(char *name, int baselen, int c) if (c == '\n') goto error_incomplete_line; } - name[baselen++] = c; - if (baselen > MAXNAME / 2) - return -1; + strbuf_addch(name, c); } /* Final ']' */ if (get_next_char() != ']') return -1; - return baselen; + return 0; error_incomplete_line: cf->linenr--; return -1; } -static int get_base_var(char *name) +static int get_base_var(struct strbuf *name) { - int baselen = 0; - for (;;) { int c = get_next_char(); if (cf->eof) return -1; if (c == ']') - return baselen; + return 0; if (isspace(c)) - return get_extended_base_var(name, baselen, c); + return get_extended_base_var(name, c); if (!iskeychar(c) && c != '.') return -1; - if (baselen > MAXNAME / 2) - return -1; - name[baselen++] = tolower(c); + strbuf_addch(name, tolower(c)); } } @@ -353,7 +343,7 @@ static int git_parse_file(config_fn_t fn, void *data) { int comment = 0; int baselen = 0; - char *var = cf->var; + struct strbuf *var = &cf->var; /* U+FEFF Byte Order Mark in UTF8 */ static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf"; @@ -389,17 +379,24 @@ static int git_parse_file(config_fn_t fn, void *data) continue; } if (c == '[') { - baselen = get_base_var(var); - if (baselen <= 0) + /* Reset prior to determining a new stem */ + strbuf_reset(var); + if (get_base_var(var) < 0 || var->len < 1) break; - var[baselen++] = '.'; - var[baselen] = 0; + strbuf_addch(var, '.'); + baselen = var->len; continue; } if (!isalpha(c)) break; - var[baselen] = tolower(c); - if (get_value(fn, data, var, baselen+1) < 0) + /* + * Truncate the var name back to the section header + * stem prior to grabbing the suffix part of the name + * and the value. + */ + strbuf_setlen(var, baselen); + strbuf_addch(var, tolower(c)); + if (get_value(fn, data, var) < 0) break; } die("bad config file line %d in %s", cf->linenr, cf->name); @@ -899,12 +896,14 @@ int git_config_from_file(config_fn_t fn, const char *filename, void *data) top.linenr = 1; top.eof = 0; strbuf_init(&top.value, 1024); + strbuf_init(&top.var, 1024); cf = ⊤ ret = git_parse_file(fn, data); /* pop config-file parsing state stack */ strbuf_release(&top.value); + strbuf_release(&top.var); cf = top.prev; fclose(f);