config.c

   1
   2 #include "cache.h"
   3
   4 #define MAXNAME (256)
   5
   6 static FILE *config_file;
   7 static int config_linenr;
   8 static int get_next_char(void)
   9 {
  10         int c;
  11         FILE *f;
  12
  13         c = '\n';
  14         if ((f = config_file) != NULL) {
  15                 c = fgetc(f);
  16                 if (c == '\r') {
  17                         /* DOS like systems */
  18                         c = fgetc(f);
  19                         if (c != '\n') {
  20                                 ungetc(c, f);
  21                                 c = '\r';
  22                         }
  23                 }
  24                 if (c == '\n')
  25                         config_linenr++;
  26                 if (c == EOF) {
  27                         config_file = NULL;
  28                         c = '\n';
  29                 }
  30         }
  31         return c;
  32 }
  33
  34 static char *parse_value(void)
  35 {
  36         static char value[1024];
  37         int quote = 0, comment = 0, len = 0, space = 0;
  38
  39         for (;;) {
  40                 int c = get_next_char();
  41                 if (len >= sizeof(value))
  42                         return NULL;
  43                 if (c == '\n') {
  44                         if (quote)
  45                                 return NULL;
  46                         value[len] = 0;
  47                         return value;
  48                 }
  49                 if (comment)
  50                         continue;
  51                 if (isspace(c) && !quote) {
  52                         space = 1;
  53                         continue;
  54                 }
  55                 if (space) {
  56                         if (len)
  57                                 value[len++] = ' ';
  58                         space = 0;
  59                 }
  60                 if (c == '\\') {
  61                         c = get_next_char();
  62                         switch (c) {
  63                         case '\n':
  64                                 continue;
  65                         case 't':
  66                                 c = '\t';
  67                                 break;
  68                         case 'b':
  69                                 c = '\b';
  70                                 break;
  71                         case 'n':
  72                                 c = '\n';
  73                                 break;
  74                         /* Some characters escape as themselves */
  75                         case '\\': case '"':
  76                                 break;
  77                         /* Reject unknown escape sequences */
  78                         default:
  79                                 return NULL;
  80                         }
  81                         value[len++] = c;
  82                         continue;
  83                 }
  84                 if (c == '"') {
  85                         quote = 1-quote;
  86                         continue;
  87                 }
  88                 if (!quote) {
  89                         if (c == ';' || c == '#') {
  90                                 comment = 1;
  91                                 continue;
  92                         }
  93                 }
  94                 value[len++] = c;
  95         }
  96 }
  97
  98 static int get_value(config_fn_t fn, char *name, unsigned int len)
  99 {
 100         int c;
 101         char *value;
 102
 103         /* Get the full name */
 104         for (;;) {
 105                 c = get_next_char();
 106                 if (c == EOF)
 107                         break;
 108                 if (!isalnum(c))
 109                         break;
 110                 name[len++] = tolower(c);
 111                 if (len >= MAXNAME)
 112                         return -1;
 113         }
 114         name[len] = 0;
 115         while (c == ' ' || c == '\t')
 116                 c = get_next_char();
 117
 118         value = NULL;
 119         if (c != '\n') {
 120                 if (c != '=')
 121                         return -1;
 122                 value = parse_value();
 123                 if (!value)
 124                         return -1;
 125         }
 126         return fn(name, value);
 127 }
 128
 129 static int get_base_var(char *name)
 130 {
 131         int baselen = 0;
 132
 133         for (;;) {
 134                 int c = get_next_char();
 135                 if (c == EOF)
 136                         return -1;
 137                 if (c == ']')
 138                         return baselen;
 139                 if (!isalnum(c))
 140                         return -1;
 141                 if (baselen > MAXNAME / 2)
 142                         return -1;
 143                 name[baselen++] = tolower(c);
 144         }
 145 }
 146
 147 static int git_parse_file(config_fn_t fn)
 148 {
 149         int comment = 0;
 150         int baselen = 0;
 151         static char var[MAXNAME];
 152
 153         for (;;) {
 154                 int c = get_next_char();
 155                 if (c == '\n') {
 156                         /* EOF? */
 157                         if (!config_file)
 158                                 return 0;
 159                         comment = 0;
 160                         continue;
 161                 }
 162                 if (comment || isspace(c))
 163                         continue;
 164                 if (c == '#' || c == ';') {
 165                         comment = 1;
 166                         continue;
 167                 }
 168                 if (c == '[') {
 169                         baselen = get_base_var(var);
 170                         if (baselen <= 0)
 171                                 break;
 172                         var[baselen++] = '.';
 173                         var[baselen] = 0;
 174                         continue;
 175                 }
 176                 if (!isalpha(c))
 177                         break;
 178                 var[baselen] = tolower(c);
 179                 if (get_value(fn, var, baselen+1) < 0)
 180                         break;
 181         }
 182         die("bad config file line %d", config_linenr);
 183 }
 184
 185 int git_config_int(const char *name, const char *value)
 186 {
 187         if (value && *value) {
 188                 char *end;
 189                 int val = strtol(value, &end, 0);
 190                 if (!*end)
 191                         return val;
 192         }
 193         die("bad config value for '%s'", name);
 194 }
 195
 196 int git_config_bool(const char *name, const char *value)
 197 {
 198         if (!value)
 199                 return 1;
 200         if (!*value)
 201                 return 0;
 202         if (!strcasecmp(value, "true"))
 203                 return 1;
 204         if (!strcasecmp(value, "false"))
 205                 return 0;
 206         return git_config_int(name, value) != 0;
 207 }
 208
 209 int git_default_config(const char *var, const char *value)
 210 {
 211         /* This needs a better name */
 212         if (!strcmp(var, "core.filemode")) {
 213                 trust_executable_bit = git_config_bool(var, value);
 214                 return 0;
 215         }
 216
 217         if (!strcmp(var, "user.name")) {
 218                 strncpy(git_default_name, value, sizeof(git_default_name));
 219                 return 0;
 220         }
 221
 222         if (!strcmp(var, "user.email")) {
 223                 strncpy(git_default_email, value, sizeof(git_default_email));
 224                 return 0;
 225         }
 226
 227         /* Add other config variables here.. */
 228         return 0;
 229 }
 230
 231 int git_config(config_fn_t fn)
 232 {
 233         int ret;
 234         FILE *f = fopen(git_path("config"), "r");
 235
 236         ret = -1;
 237         if (f) {
 238                 config_file = f;
 239                 config_linenr = 1;
 240                 ret = git_parse_file(fn);
 241                 fclose(f);
 242         }
 243         return ret;
 244 }