configfile.c

   1 /* configfile.c: parsing of config files
   2  *
   3  * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #include <git-compat-util.h>
  10 #include "configfile.h"
  11
  12 static int next_char(FILE *f)
  13 {
  14         int c = fgetc(f);
  15         if (c == '\r') {
  16                 c = fgetc(f);
  17                 if (c != '\n') {
  18                         ungetc(c, f);
  19                         c = '\r';
  20                 }
  21         }
  22         return c;
  23 }
  24
  25 static void skip_line(FILE *f)
  26 {
  27         int c;
  28
  29         while ((c = next_char(f)) && c != '\n' && c != EOF)
  30                 ;
  31 }
  32
  33 static int read_config_line(FILE *f, struct strbuf *name, struct strbuf *value)
  34 {
  35         int c = next_char(f);
  36
  37         strbuf_reset(name);
  38         strbuf_reset(value);
  39
  40         /* Skip comments and preceding spaces. */
  41         for(;;) {
  42                 if (c == '#' || c == ';')
  43                         skip_line(f);
  44                 else if (!isspace(c))
  45                         break;
  46                 c = next_char(f);
  47         }
  48
  49         /* Read variable name. */
  50         while (c != '=') {
  51                 if (c == '\n' || c == EOF)
  52                         return 0;
  53                 strbuf_addch(name, c);
  54                 c = next_char(f);
  55         }
  56
  57         /* Read variable value. */
  58         c = next_char(f);
  59         while (c != '\n' && c != EOF) {
  60                 strbuf_addch(value, c);
  61                 c = next_char(f);
  62         }
  63
  64         return 1;
  65 }
  66
  67 int parse_configfile(const char *filename, configfile_value_fn fn)
  68 {
  69         static int nesting;
  70         struct strbuf name = STRBUF_INIT;
  71         struct strbuf value = STRBUF_INIT;
  72         FILE *f;
  73
  74         /* cancel deeply nested include-commands */
  75         if (nesting > 8)
  76                 return -1;
  77         if (!(f = fopen(filename, "r")))
  78                 return -1;
  79         nesting++;
  80         while (read_config_line(f, &name, &value))
  81                 fn(name.buf, value.buf);
  82         nesting--;
  83         fclose(f);
  84         strbuf_release(&name);
  85         strbuf_release(&value);
  86         return 0;
  87 }
  88