git.mutantstargoat.com Git - andemo/blob - src/cfgopt.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <ctype.h>
   5 #include "cfgopt.h"
   6
   7 struct options opt = {
   8         0,      /* screen name */
   9         0,      /* fullscreen */
  10         1,      /* vsync */
  11         0,      /* music */
  12 };
  13
  14 static const char *usagefmt = "Usage: %s [options]\n"
  15         "Options:\n"
  16         "  -music/-nomusic      toggle music playback\n"
  17         "  -scr,-screen <name>  ignore demoscript, run specific screen\n"
  18         "  -fs/-win             run fullscreen/windowed\n"
  19         "  -vsync/-novsync      toggle vsync\n"
  20         "  -h,-help             print usage and exit\n";
  21
  22 int parse_args(int argc, char **argv)
  23 {
  24         int i;
  25         char *scrname = 0;
  26
  27         for(i=1; i<argc; i++) {
  28                 if(argv[i][0] == '-') {
  29                         if(strcmp(argv[i], "-music") == 0) {
  30                                 opt.music = 1;
  31                         } else if(strcmp(argv[i], "-nomusic") == 0) {
  32                                 opt.music = 0;
  33                         } else if(strcmp(argv[i], "-scr") == 0 || strcmp(argv[i], "-screen") == 0) {
  34                                 scrname = argv[++i];
  35                         } else if(strcmp(argv[i], "-vsync") == 0) {
  36                                 opt.vsync = 1;
  37                         } else if(strcmp(argv[i], "-novsync") == 0) {
  38                                 opt.vsync = 0;
  39                         } else if(strcmp(argv[i], "-fs") == 0) {
  40                                 opt.fullscreen = 1;
  41                         } else if(strcmp(argv[i], "-win") == 0) {
  42                                 opt.fullscreen = 0;
  43                         } else if(strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "-help") == 0) {
  44                                 printf(usagefmt, argv[0]);
  45                                 exit(0);
  46                         } else {
  47                                 fprintf(stderr, "invalid option: %s\n", argv[i]);
  48                                 fprintf(stderr, usagefmt, argv[0]);
  49                                 return -1;
  50                         }
  51                 } else {
  52                         if(scrname) {
  53                                 fprintf(stderr, "unexpected option: %s\n", argv[i]);
  54                                 fprintf(stderr, usagefmt, argv[0]);
  55                                 return -1;
  56                         }
  57                         scrname = argv[i];
  58                 }
  59         }
  60
  61         if(scrname) {
  62                 opt.scrname = scrname;
  63         }
  64         return 0;
  65 }
  66
  67
  68 static char *strip_space(char *s)
  69 {
  70         int len;
  71         char *end;
  72
  73         while(*s && isspace(*s)) ++s;
  74         if(!*s) return 0;
  75
  76         if((end = strrchr(s, '#'))) {
  77                 --end;
  78         } else {
  79                 len = strlen(s);
  80                 end = s + len - 1;
  81         }
  82
  83         while(end > s && isspace(*end)) *end-- = 0;
  84         return end > s ? s : 0;
  85 }
  86
  87 static int bool_value(char *s)
  88 {
  89         char *ptr = s;
  90         while(*ptr) {
  91                 *ptr = tolower(*ptr);
  92                 ++ptr;
  93         }
  94
  95         return strcmp(s, "true") == 0 || strcmp(s, "yes") == 0 || strcmp(s, "1") == 0;
  96 }
  97
  98 int load_config(const char *fname)
  99 {
 100         FILE *fp;
 101         char buf[256];
 102         int nline = 0;
 103
 104         if(!(fp = fopen(fname, "rb"))) {
 105                 return 0;       /* just ignore missing config files */
 106         }
 107
 108         while(fgets(buf, sizeof buf, fp)) {
 109                 char *line, *key, *value;
 110
 111                 ++nline;
 112                 if(!(line = strip_space(buf))) {
 113                         continue;
 114                 }
 115
 116                 if(!(value = strchr(line, '='))) {
 117                         fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline);
 118                         return -1;
 119                 }
 120                 *value++ = 0;
 121
 122                 if(!(key = strip_space(line)) || !(value = strip_space(value))) {
 123                         fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline);
 124                         return -1;
 125                 }
 126
 127                 if(strcmp(line, "music") == 0) {
 128                         opt.music = bool_value(value);
 129                 } else if(strcmp(line, "screen") == 0) {
 130                         opt.scrname = strdup(value);
 131                 } else if(strcmp(line, "vsync") == 0) {
 132                         opt.vsync = bool_value(value);
 133                 } else if(strcmp(line, "fullscreen") == 0) {
 134                         opt.fullscreen = bool_value(value);
 135                 } else {
 136                         fprintf(stderr, "%s:%d invalid option: %s\n", fname, nline, line);
 137                         return -1;
 138                 }
 139         }
 140         return 0;
 141 }