config.c

   1 /*
   2  * (C) Gražvydas "notaz" Ignotas, 2010
   3  *
   4  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
   5  * See the COPYING file in the top-level directory.
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <strings.h>
  12 #include <ctype.h>
  13
  14 #include "omapsdl.h"
  15
  16 int gcfg_force_vsync;
  17
  18 static char *sskip(char *p)
  19 {
  20         while (*p && isspace(*p))
  21                 p++;
  22         return p;
  23 }
  24
  25 static char *nsskip(char *p)
  26 {
  27         while (*p && !isspace(*p))
  28                 p++;
  29         return p;
  30 }
  31
  32 static int check_token(char **p_, const char *token)
  33 {
  34         char *p = *p_;
  35         int tlen = strlen(token);
  36         int ret = strncasecmp(p, token, tlen) == 0 && isspace(p[tlen]);
  37         if (ret)
  38                 *p_ = sskip(p + tlen + 1);
  39
  40         return ret;
  41 }
  42
  43 static int check_token_eq(char **p_, const char *token)
  44 {
  45         char *p = *p_;
  46         int ret = check_token(&p, token);
  47         ret = ret && *p == '=';
  48         if (ret)
  49                 *p_ = sskip(p + 1);
  50
  51         return ret;
  52 }
  53
  54 void omapsdl_config(void)
  55 {
  56         char buff[256];
  57         FILE *f;
  58
  59         f = fopen("omapsdl.cfg", "r");
  60         if (f == NULL)
  61                 return;
  62
  63         while (!feof(f)) {
  64                 char *p, *line = fgets(buff, sizeof(buff), f);
  65                 if (line == NULL)
  66                         break;
  67                 p = line = sskip(line);
  68                 if (*p == 0 || *p == '#')
  69                         continue;
  70
  71                 if (check_token(&p, "bind")) {
  72                         char *key, *key_end, *sdlkey, *sdlkey_end;
  73                         key = p;
  74                         key_end = nsskip(key);
  75                         p = sskip(key_end);
  76                         if (*p != '=')
  77                                 goto bad;
  78                         sdlkey = sskip(p + 1);
  79                         sdlkey_end = nsskip(sdlkey);
  80                         p = sskip(sdlkey_end);
  81                         if (*key == 0 || *sdlkey == 0 || *p != 0)
  82                                 goto bad;
  83                         *key_end = *sdlkey_end = 0;
  84
  85                         omapsdl_input_bind(key, sdlkey);
  86                         continue;
  87                 }
  88                 else if (check_token_eq(&p, "force_vsync")) {
  89                         gcfg_force_vsync = strtol(p, NULL, 0);
  90                         continue;
  91                 }
  92
  93 bad:
  94                 err("config: failed to parse: %s", line);
  95         }
  96         fclose(f);
  97 }
  98
  99 void omapsdl_config_from_env(void)
 100 {
 101         const char *tmp;
 102
 103         tmp = getenv("SDL_OMAP_VSYNC");
 104         if (tmp != NULL)
 105                 gcfg_force_vsync = atoi(tmp);
 106 }
 107