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Use strbuf for reading configuration files

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Use struct strbuf from Git instead of fixed-size buffers to remove the
limit on the length of configuration file lines and refactor
read_config_line() to improve readability.

Note that this also fixes a buffer overflow that existed with the
original fixed-size buffer implementation.

Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>
This commit is contained in:
Lukas Fleischer 2013-06-04 14:47:53 +00:00 committed by Jason A. Donenfeld
parent 820df9c660
commit 50e70d32f0
2 changed files with 35 additions and 31 deletions
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62
configfile.c
View File

@ -31,45 +31,45 @@ static void skip_line(FILE *f)
; ;
} }
static int read_config_line(FILE *f, char *line, const char **value, int bufsize) static int read_config_line(FILE *f, struct strbuf *name, struct strbuf *value)
{ {
int i = 0, isname = 0;
*value = NULL;
while (i < bufsize - 1) {
int c = next_char(f); int c = next_char(f);
if (!isname && (c == '#' || c == ';')) {
skip_line(f);
continue;
}
if (!isname && isspace(c))
continue;
if (c == '=' && !*value) { strbuf_reset(name);
line[i] = 0; strbuf_reset(value);
*value = &line[i + 1];
} else if (c == '\n' && !isname) { /* Skip comments and preceding spaces. */
i = 0; for(;;) {
continue; if (c == '#' || c == ';')
} else if (c == '\n' || c == EOF) { skip_line(f);
line[i] = 0; else if (!isspace(c))
break; break;
} else { c = next_char(f);
line[i] = c;
} }
isname = 1;
i++; /* Read variable name. */
while (c != '=') {
if (c == '\n' || c == EOF)
return 0;
strbuf_addch(name, c);
c = next_char(f);
} }
line[i + 1] = 0;
return i; /* Read variable value. */
c = next_char(f);
while (c != '\n' && c != EOF) {
strbuf_addch(value, c);
c = next_char(f);
}
return 1;
} }
int parse_configfile(const char *filename, configfile_value_fn fn) int parse_configfile(const char *filename, configfile_value_fn fn)
{ {
static int nesting; static int nesting;
int len; struct strbuf name = STRBUF_INIT;
char line[256]; struct strbuf value = STRBUF_INIT;
const char *value;
FILE *f; FILE *f;
/* cancel deeply nested include-commands */ /* cancel deeply nested include-commands */
@ -78,10 +78,12 @@ int parse_configfile(const char *filename, configfile_value_fn fn)
if (!(f = fopen(filename, "r"))) if (!(f = fopen(filename, "r")))
return -1; return -1;
nesting++; nesting++;
while ((len = read_config_line(f, line, &value, sizeof(line))) > 0) while (read_config_line(f, &name, &value))
fn(line, value); fn(name.buf, value.buf);
nesting--; nesting--;
fclose(f); fclose(f);
strbuf_release(&name);
strbuf_release(&value);
return 0; return 0;
} }

2
configfile.h
View File

@ -1,6 +1,8 @@
#ifndef CONFIGFILE_H #ifndef CONFIGFILE_H
#define CONFIGFILE_H #define CONFIGFILE_H
#include "cgit.h"
typedef void (*configfile_value_fn)(const char *name, const char *value); typedef void (*configfile_value_fn)(const char *name, const char *value);
extern int parse_configfile(const char *filename, configfile_value_fn fn); extern int parse_configfile(const char *filename, configfile_value_fn fn);