ref: 015637c0756837916374968c491df411ee5ddb9a
dir: /src/ini.c/
/**
* Copyright (c) 2016 rxi
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ini.h"
struct ini_t {
char *data;
char *end;
};
/* Case insensitive string compare */
static int strcmpci(const char *a, const char *b) {
for (;;) {
const int d = tolower(*a) - tolower(*b);
if (d != 0 || !*a) {
return d;
}
a++, b++;
}
}
/* Returns the next string in the split data */
static char *next(const ini_t *ini, char *p) {
p += strlen(p);
while (p < ini->end && *p == '\0') {
p++;
}
return p;
}
static void trim_back(const ini_t *ini, char *p) {
while (p >= ini->data && (*p == ' ' || *p == '\t' || *p == '\r')) {
*p-- = '\0';
}
}
static char *discard_line(const ini_t *ini, char *p) {
while (p < ini->end && *p != '\n') {
*p++ = '\0';
}
return p;
}
static char *unescape_quoted_value(const ini_t *ini, char *p) {
/* Use `q` as write-head and `p` as read-head, `p` is always ahead of `q`
* as escape sequences are always larger than their resultant data */
char *q = p;
p++;
while (p < ini->end && *p != '"' && *p != '\r' && *p != '\n') {
if (*p == '\\') {
/* Handle escaped char */
p++;
switch (*p) {
default:
*q = *p;
break;
case 'r':
*q = '\r';
break;
case 'n':
*q = '\n';
break;
case 't':
*q = '\t';
break;
case '\r':
case '\n':
case '\0':
goto end;
}
} else {
/* Handle normal char */
*q = *p;
}
q++, p++;
}
end:
return q;
}
/* Splits data in place into strings containing section-headers, keys and
* values using one or more '\0' as a delimiter. Unescapes quoted values */
static void split_data(const ini_t *ini) {
char *value_start, *line_start;
char *p = ini->data;
while (p < ini->end) {
switch (*p) {
case '\r':
case '\n':
case '\t':
case ' ':
*p = '\0';
/* Fall through */
case '\0':
p++;
break;
case '[':
p += strcspn(p, "]\n");
*p = '\0';
break;
case ';':
p = discard_line(ini, p);
break;
default:
line_start = p;
p += strcspn(p, "=\n");
/* Is line missing a '='? */
if (*p != '=') {
p = discard_line(ini, line_start);
break;
}
trim_back(ini, p - 1);
/* Replace '=' and whitespace after it with '\0' */
do {
*p++ = '\0';
} while (*p == ' ' || *p == '\r' || *p == '\t');
/* Is a value after '=' missing? */
if (*p == '\n' || *p == '\0') {
p = discard_line(ini, line_start);
break;
}
if (*p == '"') {
/* Handle quoted string value */
value_start = p;
p = unescape_quoted_value(ini, p);
/* Was the string empty? */
if (p == value_start) {
p = discard_line(ini, line_start);
break;
}
/* Discard the rest of the line after the string value */
p = discard_line(ini, p);
} else {
/* Handle normal value */
p += strcspn(p, "\n");
trim_back(ini, p - 1);
}
break;
}
}
}
ini_t *ini_load(const char *filename) {
ini_t *ini = NULL;
FILE *fp = NULL;
int n, sz;
/* Init ini struct */
ini = malloc(sizeof(*ini));
if (!ini) {
goto fail;
}
memset(ini, 0, sizeof(*ini));
/* Open file */
fp = fopen(filename, "rb");
if (!fp) {
goto fail;
}
/* Get file size */
fseek(fp, 0, SEEK_END);
sz = ftell(fp);
if (sz == 0) {
goto fail;
}
rewind(fp);
/* Load file content into memory, null terminate, init end var */
ini->data = malloc(sz + 1);
ini->data[sz] = '\0';
ini->end = ini->data + sz;
n = fread(ini->data, 1, sz, fp);
if (n != sz) {
goto fail;
}
/* Prepare data */
split_data(ini);
/* Clean up and return */
fclose(fp);
return ini;
fail:
if (fp)
fclose(fp);
if (ini)
ini_free(ini);
return NULL;
}
void ini_free(ini_t *ini) {
free(ini->data);
free(ini);
}
const char *ini_get(const ini_t *ini, const char *section, const char *key) {
const char *current_section = "";
char *p = ini->data;
if (*p == '\0') {
p = next(ini, p);
}
while (p < ini->end) {
if (*p == '[') {
/* Handle section */
current_section = p + 1;
} else {
/* Handle key */
char *val = next(ini, p);
if (!section || !strcmpci(section, current_section)) {
if (!strcmpci(p, key)) {
return val;
}
}
p = val;
}
p = next(ini, p);
}
return NULL;
}
int ini_sget(const ini_t *ini, const char *section, const char *key, const char *scanfmt,
void *dst) {
const char *val = ini_get(ini, section, key);
if (!val) {
return 0;
}
if (scanfmt) {
sscanf(val, scanfmt, dst);
} else {
*(const char **)dst = val;
}
return 1;
}