Use strbuf for reading configuration files 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>
Lukas Fleischer cgit@cryptocrack.de
Tue, 04 Jun 2013 14:47:53 +0000
2 files changed,
35 insertions(+),
31 deletions(-)
M
configfile.c
→
configfile.c
@@ -31,45 +31,45 @@ while ((c = next_char(f)) && c != '\n' && c != EOF)
; } -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; + int c = next_char(f); - *value = NULL; - while (i < bufsize - 1) { - int c = next_char(f); - if (!isname && (c == '#' || c == ';')) { - skip_line(f); - continue; - } - if (!isname && isspace(c)) - continue; + strbuf_reset(name); + strbuf_reset(value); - if (c == '=' && !*value) { - line[i] = 0; - *value = &line[i + 1]; - } else if (c == '\n' && !isname) { - i = 0; - continue; - } else if (c == '\n' || c == EOF) { - line[i] = 0; + /* Skip comments and preceding spaces. */ + for(;;) { + if (c == '#' || c == ';') + skip_line(f); + else if (!isspace(c)) break; - } else { - line[i] = c; - } - isname = 1; - i++; + c = next_char(f); } - line[i + 1] = 0; - return i; + + /* Read variable name. */ + while (c != '=') { + if (c == '\n' || c == EOF) + return 0; + strbuf_addch(name, c); + c = next_char(f); + } + + /* 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) { static int nesting; - int len; - char line[256]; - const char *value; + struct strbuf name = STRBUF_INIT; + struct strbuf value = STRBUF_INIT; FILE *f; /* cancel deeply nested include-commands */@@ -78,10 +78,12 @@ return -1;
if (!(f = fopen(filename, "r"))) return -1; nesting++; - while ((len = read_config_line(f, line, &value, sizeof(line))) > 0) - fn(line, value); + while (read_config_line(f, &name, &value)) + fn(name.buf, value.buf); nesting--; fclose(f); + strbuf_release(&name); + strbuf_release(&value); return 0; }
M
configfile.h
→
configfile.h
@@ -1,6 +1,8 @@
#ifndef CONFIGFILE_H #define CONFIGFILE_H +#include "cgit.h" + typedef void (*configfile_value_fn)(const char *name, const char *value); extern int parse_configfile(const char *filename, configfile_value_fn fn);