/* 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

*/

#include "config.h"

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

#define _CRT_SECURE_NO_WARNINGS

#endif

#include <stdio.h>

#include <ctype.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_file(FILE *file, 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];

  int max_line = INI_MAX_LINE;

#else

  char *line;

  int max_line = INI_INITIAL_ALLOC;

#endif

#if INI_ALLOW_REALLOC && !INI_USE_STACK

  char *new_line;

  int offset;

#endif

  char section[MAX_SECTION] = "";

  char prev_name[MAX_NAME] = "";

  char *end;

  char *name;

  char *value;

  int lineno = 0;

  int error = 0;

#if !INI_USE_STACK

  line = (char *)malloc(INI_INITIAL_ALLOC);

  if (!line) {

    return -2;

  }

#endif

#if INI_HANDLER_LINENO

#define HANDLER(u, s, n, v) handler(u, s, n, v, lineno)

#else

#define HANDLER(u, s, n, v) handler(u, s, n, v)

#endif

  /* Scan through stream line by line */

  while (fgets(line, max_line, file) != NULL) {

    char *start;

#if INI_ALLOW_REALLOC && !INI_USE_STACK

    offset = strlen(line);

    while (offset == max_line - 1 && line[offset - 1] != '\n') {

      max_line *= 2;

      if (max_line > INI_MAX_LINE)

        max_line = INI_MAX_LINE;

      new_line = realloc(line, max_line);

      if (!new_line) {

        free(line);

        return -2;

      }

      line = new_line;

      if (fgets(line + offset, max_line - offset, file) ==

          NULL)

        break;

      if (max_line >= INI_MAX_LINE)

        break;

      offset += strlen(line + offset);

    }

#endif

    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 (strchr(INI_START_COMMENT_PREFIXES, *start)) {

      /* Start-of-line comment */

    }

#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 = end + 1;

#if INI_ALLOW_INLINE_COMMENTS

        end = find_chars_or_comment(value, NULL);

        if (*end)

          *end = '\0';

#endif

        value = lskip(value);

        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;

      } 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;

}