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mpv/options/parse_configfile.c
wm4 cc54377463 Do not call strerror() 
...because everything is terrible.

strerror() is not documented as having to be thread-safe by POSIX and
C11. (Which is pretty much bullshit, because both mandate threads and
some form of thread-local storage - so there's no excuse why
implementation couldn't implement this in a thread-safe way. Especially
with C11 this is ridiculous, because there is no way to use threads and
convert error numbers to strings at the same time!)

Since we heavily use threads now, we should avoid unsafe functions like
strerror().

strerror_r() is in POSIX, but GNU/glibc deliberately fucks it up and
gives the function different semantics than the POSIX one. It's a bit of
work to convince this piece of shit to expose the POSIX standard
function, and not the messed up GNU one.

strerror_l() is also in POSIX, but only since the 2008 standard, and
thus is not widespread.

The solution is using avlibc (libavutil, by its official name), which
handles the unportable details for us, mostly. We avoid some pain.
2014-11-26 21:21:56 +01:00

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/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "osdep/io.h"
#include "parse_configfile.h"
#include "common/common.h"
#include "common/msg.h"
#include "misc/ctype.h"
#include "m_option.h"
#include "m_config.h"
/// Maximal include depth.
#define MAX_RECURSION_DEPTH 8
// Load options and profiles from from a config file.
// conffile: path to the config file
// initial_section: default section where to add normal options
// flags: M_SETOPT_* bits
// returns: 1 on sucess, -1 on error, 0 if file not accessible.
int m_config_parse_config_file(m_config_t *config, const char *conffile,
char *initial_section, int flags)
{
#define PRINT_LINENUM MP_ERR(config, "%s:%d: ", conffile, line_num)
#define MAX_LINE_LEN 10000
#define MAX_OPT_LEN 1000
#define MAX_PARAM_LEN 1500
FILE *fp = NULL;
char *line = NULL;
char opt[MAX_OPT_LEN + 1];
char param[MAX_PARAM_LEN + 1];
char c; /* for the "" and '' check */
int tmp;
int line_num = 0;
int line_pos; /* line pos */
int opt_pos; /* opt pos */
int param_pos; /* param pos */
int ret = 1;
int errors = 0;
m_profile_t *profile = m_config_add_profile(config, initial_section);
flags = flags | M_SETOPT_FROM_CONFIG_FILE;
MP_VERBOSE(config, "Reading config file %s\n", conffile);
if (config->recursion_depth > MAX_RECURSION_DEPTH) {
MP_ERR(config, "Maximum 'include' nesting depth exceeded.\n");
ret = -1;
goto out;
}
if ((line = malloc(MAX_LINE_LEN + 1)) == NULL) {
ret = -1;
goto out;
} else
MP_VERBOSE(config, "\n");
if ((fp = fopen(conffile, "r")) == NULL) {
MP_VERBOSE(config, "Can't open config file: %s\n", mp_strerror(errno));
ret = 0;
goto out;
}
while (fgets(line, MAX_LINE_LEN, fp)) {
if (errors >= 16) {
MP_FATAL(config, "too many errors\n");
goto out;
}
line_num++;
line_pos = 0;
/* skip BOM */
if (strncmp(line, "\xEF\xBB\xBF", 3) == 0)
line_pos += 3;
/* skip whitespaces */
while (mp_isspace(line[line_pos]))
++line_pos;
/* EOL / comment */
if (line[line_pos] == '\0' || line[line_pos] == '#')
continue;
/* read option. */
for (opt_pos = 0; mp_isprint(line[line_pos]) &&
line[line_pos] != ' ' &&
line[line_pos] != '#' &&
line[line_pos] != '='; /* NOTHING */) {
opt[opt_pos++] = line[line_pos++];
if (opt_pos >= MAX_OPT_LEN) {
PRINT_LINENUM;
MP_ERR(config, "option name too long\n");
errors++;
ret = -1;
goto nextline;
}
}
if (opt_pos == 0) {
PRINT_LINENUM;
MP_ERR(config, "parse error\n");
ret = -1;
errors++;
continue;
}
opt[opt_pos] = '\0';
/* Profile declaration */
if (opt_pos > 2 && opt[0] == '[' && opt[opt_pos - 1] == ']') {
opt[opt_pos - 1] = '\0';
profile = m_config_add_profile(config, opt + 1);
continue;
}
/* skip whitespaces */
while (mp_isspace(line[line_pos]))
++line_pos;
param_pos = 0;
bool param_set = false;
/* check '=' */
if (line[line_pos] == '=') {
line_pos++;
param_set = true;
/* whitespaces... */
while (mp_isspace(line[line_pos]))
++line_pos;
/* read the parameter */
if (line[line_pos] == '"' || line[line_pos] == '\'') {
c = line[line_pos];
++line_pos;
for (param_pos = 0; line[line_pos] != c; /* NOTHING */) {
if (!line[line_pos]) {
PRINT_LINENUM;
MP_ERR(config, "unterminated quotes\n");
ret = -1;
errors++;
goto nextline;
}
param[param_pos++] = line[line_pos++];
if (param_pos >= MAX_PARAM_LEN) {
PRINT_LINENUM;
MP_ERR(config, "option %s has a too long parameter\n", opt);
ret = -1;
errors++;
goto nextline;
}
}
line_pos++; /* skip the closing " or ' */
goto param_done;
}
if (line[line_pos] == '%') {
char *start = &line[line_pos + 1];
char *end = start;
unsigned long len = strtoul(start, &end, 10);
if (start != end && end[0] == '%') {
if (len >= MAX_PARAM_LEN - 1 ||
strlen(end + 1) < len)
{
PRINT_LINENUM;
MP_ERR(config, "bogus %% length\n");
ret = -1;
errors++;
goto nextline;
}
param_pos = snprintf(param, sizeof(param), "%.*s",
(int)len, end + 1);
line_pos += 1 + (end - start) + 1 + len;
goto param_done;
}
}
for (param_pos = 0; mp_isprint(line[line_pos])
&& !mp_isspace(line[line_pos])
&& line[line_pos] != '#'; /* NOTHING */) {
param[param_pos++] = line[line_pos++];
if (param_pos >= MAX_PARAM_LEN) {
PRINT_LINENUM;
MP_ERR(config, "too long parameter\n");
ret = -1;
errors++;
goto nextline;
}
}
param_done:
while (mp_isspace(line[line_pos]))
++line_pos;
}
param[param_pos] = '\0';
/* EOL / comment */
if (line[line_pos] != '\0' && line[line_pos] != '#') {
PRINT_LINENUM;
MP_ERR(config, "extra characters: %s\n", line + line_pos);
ret = -1;
}
bstr bopt = bstr0(opt);
bstr bparam = bstr0(param);
if (bopt.len >= 3)
bstr_eatstart0(&bopt, "--");
if (profile && bstr_equals0(bopt, "profile-desc")) {
m_profile_set_desc(profile, bparam);
goto nextline;
}
bool need_param = m_config_option_requires_param(config, bopt) > 0;
if (need_param && !param_set) {
PRINT_LINENUM;
MP_ERR(config, "error parsing option %.*s=%.*s: %s\n",
BSTR_P(bopt), BSTR_P(bparam),
m_option_strerror(M_OPT_MISSING_PARAM));
continue;
}
if (profile) {
tmp = m_config_set_profile_option(config, profile, bopt, bparam);
} else {
tmp = m_config_set_option_ext(config, bopt, bparam, flags);
}
if (tmp < 0) {
PRINT_LINENUM;
MP_ERR(config, "setting option %.*s='%.*s' failed.\n",
BSTR_P(bopt), BSTR_P(bparam));
continue;
/* break */
}
nextline:
;
}
out:
free(line);
if (fp)
fclose(fp);
config->recursion_depth -= 1;
if (ret < 0) {
MP_FATAL(config, "Error loading config file %s.\n",
conffile);
}
return ret;
}
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