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/*
* Copyright (C) 2007 Stig Venaas <venaas@uninett.no>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include "debug.h"
#include "util.h"
#include "gconfig.h"
/* returns NULL on error, where to continue parsing if token and ok. E.g. "" will return token with empty string */
char *strtokenquote(char *s, char **token, char *del, char *quote, char *comment) {
char *t = s, *q, *r;
if (!t || !token || !del)
return NULL;
while (*t && strchr(del, *t))
t++;
if (!*t || (comment && strchr(comment, *t))) {
*token = NULL;
return t + 1; /* needs to be non-NULL, but value doesn't matter */
}
if (quote && (q = strchr(quote, *t))) {
t++;
r = t;
while (*t && *t != *q)
t++;
if (!*t || (t[1] && !strchr(del, t[1])))
return NULL;
*t = '\0';
*token = r;
return t + 1;
}
*token = t;
t++;
while (*t && !strchr(del, *t))
t++;
*t = '\0';
return t + 1;
}
FILE *pushgconffile(struct gconffile **cf, const char *path) {
int i;
struct gconffile *newcf;
FILE *f;
f = fopen(path, "r");
if (!f) {
debug(DBG_INFO, "could not read config file %s", path);
return NULL;
}
debug(DBG_DBG, "opened config file %s", path);
if (!*cf) {
newcf = malloc(sizeof(struct gconffile) * 2);
if (!newcf)
debugx(1, DBG_ERR, "malloc failed");
newcf[1].file = NULL;
newcf[1].path = NULL;
} else {
for (i = 0; (*cf)[i].path; i++);
newcf = realloc(*cf, sizeof(struct gconffile) * (i + 2));
if (!newcf)
debugx(1, DBG_ERR, "malloc failed");
memmove(newcf + 1, newcf, sizeof(struct gconffile) * (i + 1));
}
newcf[0].file = f;
newcf[0].path = stringcopy(path, 0);
*cf = newcf;
return f;
}
FILE *popgconffile(struct gconffile **cf) {
int i;
if (!*cf)
return NULL;
for (i = 0; (*cf)[i].path; i++);
if (i && (*cf)[0].file) {
fclose((*cf)[0].file);
debug(DBG_DBG, "closing config file %s", (*cf)[0].path);
}
if (i < 2) {
free(*cf);
*cf = NULL;
return NULL;
}
memmove(*cf, *cf + 1, sizeof(struct gconffile) * i);
return (*cf)[0].file;
}
/* Parses config with following syntax:
* One of these:
* option-name value
* option-name = value
* Or:
* option-name value {
* option-name [=] value
* ...
* }
*/
void getgenericconfig(struct gconffile **cf, char *block, ...) {
va_list ap;
char line[1024];
/* initialise lots of stuff to avoid stupid compiler warnings */
char *tokens[3], *s, *opt = NULL, *val = NULL, *word, *optval, **str = NULL, ***mstr = NULL;
int type = 0, tcount, conftype = 0, n;
void (*cbk)(struct gconffile **, char *, char *, char *) = NULL;
if (!cf || !*cf || !(*cf)->file)
return;
for (;;) {
if (!fgets(line, 1024, (*cf)->file)) {
if (popgconffile(cf))
continue;
return;
}
s = line;
for (tcount = 0; tcount < 3; tcount++) {
s = strtokenquote(s, &tokens[tcount], " \t\r\n", "\"'", tcount ? NULL : "#");
if (!s)
debugx(1, DBG_ERR, "Syntax error in line starting with: %s", line);
if (!tokens[tcount])
break;
}
if (!tcount || **tokens == '#')
continue;
if (**tokens == '}') {
if (block)
return;
debugx(1, DBG_ERR, "configuration error, found } with no matching {");
}
switch (tcount) {
case 2:
opt = tokens[0];
val = tokens[1];
conftype = CONF_STR;
break;
case 3:
if (tokens[1][0] == '=' && tokens[1][1] == '\0') {
opt = tokens[0];
val = tokens[2];
conftype = CONF_STR;
break;
}
if (tokens[2][0] == '{' && tokens[2][1] == '\0') {
opt = tokens[0];
val = tokens[1];
conftype = CONF_CBK;
break;
}
/* fall through */
default:
if (block)
debugx(1, DBG_ERR, "configuration error in block %s, line starting with %s", block, tokens[0]);
debugx(1, DBG_ERR, "configuration error, syntax error in line starting with %s", tokens[0]);
}
if (!*val)
debugx(1, DBG_ERR, "configuration error, option %s needs a non-empty value", opt);
if (conftype == CONF_STR && !strcasecmp(opt, "include")) {
pushgconffile(cf, val);
continue;
}
va_start(ap, block);
while ((word = va_arg(ap, char *))) {
type = va_arg(ap, int);
switch (type) {
case CONF_STR:
str = va_arg(ap, char **);
if (!str)
debugx(1, DBG_ERR, "getgeneralconfig: internal parameter error");
break;
case CONF_MSTR:
mstr = va_arg(ap, char ***);
if (!mstr)
debugx(1, DBG_ERR, "getgeneralconfig: internal parameter error");
break;
case CONF_CBK:
cbk = va_arg(ap, void (*)(struct gconffile **, char *, char *, char *));
break;
default:
debugx(1, DBG_ERR, "getgeneralconfig: internal parameter error");
}
if (!strcasecmp(opt, word))
break;
}
va_end(ap);
if (!word) {
if (block)
debugx(1, DBG_ERR, "configuration error in block %s, unknown option %s", block, opt);
debugx(1, DBG_ERR, "configuration error, unknown option %s", opt);
}
if (((type == CONF_STR || type == CONF_MSTR) && conftype != CONF_STR) ||
(type == CONF_CBK && conftype != CONF_CBK)) {
if (block)
debugx(1, DBG_ERR, "configuration error in block %s, wrong syntax for option %s", block, opt);
debugx(1, DBG_ERR, "configuration error, wrong syntax for option %s", opt);
}
switch (type) {
case CONF_STR:
if (block)
debug(DBG_DBG, "getgeneralconfig: block %s: %s = %s", block, opt, val);
else
debug(DBG_DBG, "getgeneralconfig: %s = %s", opt, val);
if (*str)
debugx(1, DBG_ERR, "configuration error, option %s already set to %s", opt, *str);
*str = stringcopy(val, 0);
if (!*str)
debugx(1, DBG_ERR, "malloc failed");
break;
case CONF_MSTR:
if (block)
debug(DBG_DBG, "getgeneralconfig: block %s: %s = %s", block, opt, val);
else
debug(DBG_DBG, "getgeneralconfig: %s = %s", opt, val);
if (*mstr)
for (n = 0; (*mstr)[n]; n++);
else
n = 0;
*mstr = realloc(*mstr, sizeof(char *) * (n + 2));
if (!*mstr)
debugx(1, DBG_ERR, "malloc failed");
(*mstr)[n] = stringcopy(val, 0);
(*mstr)[n + 1] = NULL;
break;
case CONF_CBK:
optval = malloc(strlen(opt) + strlen(val) + 2);
if (!optval)
debugx(1, DBG_ERR, "malloc failed");
sprintf(optval, "%s %s", opt, val);
cbk(cf, optval, opt, val);
free(optval);
break;
default:
debugx(1, DBG_ERR, "getgeneralconfig: internal parameter error");
}
}
}
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