Megapixels/src/ini.c

/* inih -- simple .INI file parser

inih is released under the New BSD license (see LICENSE.txt). Go to the project
home page for more info:

https://github.com/benhoyt/inih

*/

#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)
#define _CRT_SECURE_NO_WARNINGS
#endif

#include <ctype.h>
#include <stdio.h>
#include <string.h>

#include "ini.h"

#if !INI_USE_STACK
#include <stdlib.h>
#endif

#define MAX_SECTION 50
#define MAX_NAME 50

/* Strip whitespace chars off end of given string, in place. Return s. */
static char *
rstrip(char *s)
{
        char *p = s + strlen(s);
        while (p > s && isspace((unsigned char)(*--p)))
                *p = '\0';
        return s;
}

/* Return pointer to first non-whitespace char in given string. */
static char *
lskip(const char *s)
{
        while (*s && isspace((unsigned char)(*s)))
                s++;
        return (char *)s;
}

/* Return pointer to first char (of chars) or inline comment in given string,
   or pointer to null at end of string if neither found. Inline comment must
   be prefixed by a whitespace character to register as a comment. */
static char *
find_chars_or_comment(const char *s, const char *chars)
{
#if INI_ALLOW_INLINE_COMMENTS
        int was_space = 0;
        while (*s && (!chars || !strchr(chars, *s)) &&
               !(was_space && strchr(INI_INLINE_COMMENT_PREFIXES, *s))) {
                was_space = isspace((unsigned char)(*s));
                s++;
        }
#else
        while (*s && (!chars || !strchr(chars, *s))) {
                s++;
        }
#endif
        return (char *)s;
}

/* Version of strncpy that ensures dest (size bytes) is null-terminated. */
static char *
strncpy0(char *dest, const char *src, size_t size)
{
        strncpy(dest, src, size - 1);
        dest[size - 1] = '\0';
        return dest;
}

/* See documentation in header file. */
int
ini_parse_stream(ini_reader reader, void *stream, ini_handler handler, void *user)
{
        /* Uses a fair bit of stack (use heap instead if you need to) */
#if INI_USE_STACK
        char line[INI_MAX_LINE];
#else
        char *line;
#endif
        char section[MAX_SECTION] = "";
        char prev_name[MAX_NAME] = "";

        char *start;
        char *end;
        char *name;
        char *value;
        int lineno = 0;
        int error = 0;

#if !INI_USE_STACK
        line = (char *)malloc(INI_MAX_LINE);
        if (!line) {
                return -2;
        }
#endif

        /* Scan through stream line by line */
        while (reader(line, INI_MAX_LINE, stream) != NULL) {
                lineno++;

                start = line;
#if INI_ALLOW_BOM
                if (lineno == 1 && (unsigned char)start[0] == 0xEF &&
                    (unsigned char)start[1] == 0xBB &&
                    (unsigned char)start[2] == 0xBF) {
                        start += 3;
                }
#endif
                start = lskip(rstrip(start));

                if (*start == ';' || *start == '#') {
                        /* Per Python configparser, allow both ; and # comments at
               the start of a line */
                }
#if INI_ALLOW_MULTILINE
                else if (*prev_name && *start && start > line) {
                        /* Non-blank line with leading whitespace, treat as
               continuation of previous name's value (as per Python configparser). */
                        if (!handler(user, section, prev_name, start) && !error)
                                error = lineno;
                }
#endif
                else if (*start == '[') {
                        /* A "[section]" line */
                        end = find_chars_or_comment(start + 1, "]");
                        if (*end == ']') {
                                *end = '\0';
                                strncpy0(section, start + 1, sizeof(section));
                                *prev_name = '\0';
                        } else if (!error) {
                                /* No ']' found on section line */
                                error = lineno;
                        }
                } else if (*start) {
                        /* Not a comment, must be a name[=:]value pair */
                        end = find_chars_or_comment(start, "=:");
                        if (*end == '=' || *end == ':') {
                                *end = '\0';
                                name = rstrip(start);
                                value = lskip(end + 1);
#if INI_ALLOW_INLINE_COMMENTS
                                end = find_chars_or_comment(value, NULL);
                                if (*end)
                                        *end = '\0';
#endif
                                rstrip(value);

                                /* Valid name[=:]value pair found, call handler */
                                strncpy0(prev_name, name, sizeof(prev_name));
                                if (!handler(user, section, name, value) && !error)
                                        error = lineno;
                                memset(value, 0, strlen(value));
                        } else if (!error) {
                                /* No '=' or ':' found on name[=:]value line */
                                error = lineno;
                        }
                }

#if INI_STOP_ON_FIRST_ERROR
                if (error)
                        break;
#endif
        }

#if !INI_USE_STACK
        free(line);
#endif

        return error;
}

/* See documentation in header file. */
int
ini_parse_file(FILE *file, ini_handler handler, void *user)
{
        return ini_parse_stream((ini_reader)fgets, file, handler, user);
}

/* See documentation in header file. */
int
ini_parse(const char *filename, ini_handler handler, void *user)
{
        FILE *file;
        int error;

        file = fopen(filename, "r");
        if (!file)
                return -1;
        error = ini_parse_file(file, handler, user);
        fclose(file);
        return error;
}