share/common.c

   1 /*
   2  *  Copyright (C) 2007  Neverball authors
   3  *
   4  *  This  program is  free software;  you can  redistribute  it and/or
   5  *  modify it  under the  terms of the  GNU General Public  License as
   6  *  published by the Free Software Foundation; either version 2 of the
   7  *  License, or (at your option) any later version.
   8  *
   9  *  This program  is distributed in the  hope that it  will be useful,
  10  *  but  WITHOUT ANY WARRANTY;  without even  the implied  warranty of
  11  *  MERCHANTABILITY or FITNESS FOR  A PARTICULAR PURPOSE.  See the GNU
  12  *  General Public License for more details.
  13  *
  14  *  You should have received a  copy of the GNU General Public License
  15  *  along  with this  program;  if  not, write  to  the Free  Software
  16  *  Foundation,  Inc.,   59  Temple  Place,  Suite   330,  Boston,  MA
  17  *  02111-1307 USA
  18  */
  19
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <time.h>
  24 #include <ctype.h>
  25 #include <stdarg.h>
  26 #include <assert.h>
  27
  28 #include "common.h"
  29 #include "fs.h"
  30
  31 #define MAXSTR 256
  32
  33 /*---------------------------------------------------------------------------*/
  34
  35 int read_line(char **dst, fs_file fin)
  36 {
  37     char buff[MAXSTR];
  38
  39     char *line, *new;
  40     size_t len0, len1;
  41
  42     line = NULL;
  43
  44     while (fs_gets(buff, sizeof (buff), fin))
  45     {
  46         /* Append to data read so far. */
  47
  48         if (line)
  49         {
  50             new  = concat_string(line, buff, NULL);
  51             free(line);
  52             line = new;
  53         }
  54         else
  55         {
  56             line = strdup(buff);
  57         }
  58
  59         /* Strip newline, if any. */
  60
  61         len0 = strlen(line);
  62         strip_newline(line);
  63         len1 = strlen(line);
  64
  65         if (len1 != len0)
  66         {
  67             /* We hit a newline, clean up and break. */
  68             line = realloc(line, len1 + 1);
  69             break;
  70         }
  71     }
  72
  73     return (*dst = line) ? 1 : 0;
  74 }
  75
  76 char *strip_newline(char *str)
  77 {
  78     char *c = str + strlen(str) - 1;
  79
  80     while (c >= str && (*c == '\n' || *c =='\r'))
  81         *c-- = '\0';
  82
  83     return str;
  84 }
  85
  86 char *dupe_string(const char *src)
  87 {
  88     char *dst = NULL;
  89
  90     if (src && (dst = malloc(strlen(src) + 1)))
  91         strcpy(dst, src);
  92
  93     return dst;
  94 }
  95
  96 char *concat_string(const char *first, ...)
  97 {
  98     char *full;
  99
 100     if ((full = strdup(first)))
 101     {
 102         const char *part;
 103         va_list ap;
 104
 105         va_start(ap, first);
 106
 107         while ((part = va_arg(ap, const char *)))
 108         {
 109             char *new;
 110
 111             if ((new = realloc(full, strlen(full) + strlen(part) + 1)))
 112             {
 113                 full = new;
 114                 strcat(full, part);
 115             }
 116             else
 117             {
 118                 free(full);
 119                 full = NULL;
 120                 break;
 121             }
 122         }
 123
 124         va_end(ap);
 125     }
 126
 127     return full;
 128 }
 129
 130 time_t make_time_from_utc(struct tm *tm)
 131 {
 132     struct tm local, *utc;
 133     time_t t;
 134
 135     t = mktime(tm);
 136
 137     local = *localtime(&t);
 138     utc   =  gmtime(&t);
 139
 140     local.tm_year += local.tm_year - utc->tm_year;
 141     local.tm_mon  += local.tm_mon  - utc->tm_mon ;
 142     local.tm_mday += local.tm_mday - utc->tm_mday;
 143     local.tm_hour += local.tm_hour - utc->tm_hour;
 144     local.tm_min  += local.tm_min  - utc->tm_min ;
 145     local.tm_sec  += local.tm_sec  - utc->tm_sec ;
 146
 147     return mktime(&local);
 148 }
 149
 150 const char *date_to_str(time_t i)
 151 {
 152     static char str[sizeof ("YYYY-mm-dd HH:MM:SS")];
 153     strftime(str, sizeof (str), "%Y-%m-%d %H:%M:%S", localtime(&i));
 154     return str;
 155 }
 156
 157 int file_exists(const char *name)
 158 {
 159     FILE *fp;
 160
 161     if ((fp = fopen(name, "r")))
 162     {
 163         fclose(fp);
 164         return 1;
 165     }
 166     return 0;
 167 }
 168
 169 int file_rename(const char *src, const char *dst)
 170 {
 171 #ifdef _WIN32
 172     if (file_exists(dst))
 173         remove(dst);
 174 #endif
 175     return rename(src, dst);
 176 }
 177
 178 void file_copy(FILE *fin, FILE *fout)
 179 {
 180     char   buff[MAXSTR];
 181     size_t size;
 182
 183     while ((size = fread(buff, 1, sizeof (buff), fin)) > 0)
 184         fwrite(buff, 1, size, fout);
 185 }
 186
 187 /*---------------------------------------------------------------------------*/
 188
 189 int path_is_sep(int c)
 190 {
 191 #ifdef _WIN32
 192     return c == '/' || c == '\\';
 193 #else
 194     return c == '/';
 195 #endif
 196 }
 197
 198 int path_is_abs(const char *path)
 199 {
 200     if (path_is_sep(path[0]))
 201         return 1;
 202
 203 #ifdef _WIN32
 204     if (isalpha(path[0]) && path[1] == ':' && path_is_sep(path[2]))
 205         return 1;
 206 #endif
 207
 208     return 0;
 209 }
 210
 211 char *path_join(const char *head, const char *tail)
 212 {
 213     return *head ? concat_string(head, "/", tail, NULL) : strdup(tail);
 214 }
 215
 216 const char *path_last_sep(const char *path)
 217 {
 218     const char *sep;
 219
 220     sep = strrchr(path, '/');
 221
 222 #ifdef _WIN32
 223     if (!sep)
 224     {
 225         sep = strrchr(path, '\\');
 226     }
 227     else
 228     {
 229         const char *tmp;
 230
 231         if ((tmp = strrchr(path, '\\')) && sep < tmp)
 232             sep = tmp;
 233     }
 234 #endif
 235
 236     return sep;
 237 }
 238
 239 const char *path_next_sep(const char *path)
 240 {
 241     size_t skip;
 242
 243 #ifdef _WIN32
 244     skip = strcspn(path, "/\\");
 245 #else
 246     skip = strcspn(path, "/");
 247 #endif
 248
 249     return *(path + skip) ? path + skip : NULL;
 250 }
 251
 252 char *path_normalize(char *path)
 253 {
 254     char *sep = path;
 255
 256     while ((sep = (char *) path_next_sep(sep)))
 257         *sep++ = '/';
 258
 259     return path;
 260 }
 261
 262 const char *base_name_sans(const char *name, const char *suffix)
 263 {
 264     static char base[MAXSTR];
 265     size_t blen, slen;
 266
 267     if (!name)
 268         return NULL;
 269     if (!suffix)
 270         return base_name(name);
 271
 272     /* Remove the directory part. */
 273
 274     SAFECPY(base, base_name(name));
 275
 276     /* Remove the suffix. */
 277
 278     blen = strlen(base);
 279     slen = strlen(suffix);
 280
 281     if (blen >= slen && strcmp(base + blen - slen, suffix) == 0)
 282         base[blen - slen] = '\0';
 283
 284     return base;
 285 }
 286
 287 const char *base_name(const char *name)
 288 {
 289     const char *sep;
 290     return (name && (sep = path_last_sep(name))) ? sep + 1 : name;
 291 }
 292
 293 const char *dir_name(const char *name)
 294 {
 295     static char buff[MAXSTR];
 296
 297     char *sep;
 298
 299     SAFECPY(buff, name);
 300
 301     if ((sep = (char *) path_last_sep(buff)))
 302     {
 303         if (sep == buff)
 304             return "/";
 305
 306         *sep = '\0';
 307
 308         return buff;
 309     }
 310
 311     return ".";
 312 }
 313
 314 /*---------------------------------------------------------------------------*/
 315
 316 int rand_between(int low, int high)
 317 {
 318     return low + rand() / (RAND_MAX / (high - low + 1) + 1);
 319 }
 320
 321 /*---------------------------------------------------------------------------*/
 322
 323 #ifdef _WIN32
 324
 325 /* MinGW hides this from ANSI C. MinGW-w64 doesn't. */
 326 _CRTIMP int _putenv(const char *envstring);
 327
 328 int set_env_var(const char *name, const char *value)
 329 {
 330     if (name)
 331     {
 332         char str[MAXSTR];
 333
 334         if (value)
 335             sprintf(str, "%s=%s", name, value);
 336         else
 337             sprintf(str, "%s=", name);
 338
 339         return (_putenv(str) == 0);
 340     }
 341     return 0;
 342 }
 343
 344 #else
 345
 346 extern int setenv(const char *name, const char *value, int overwrite);
 347 extern int unsetenv(const char *name);
 348
 349 int set_env_var(const char *name, const char *value)
 350 {
 351     if (name)
 352     {
 353         if (value)
 354             return (setenv(name, value, 1) == 0);
 355         else
 356             return (unsetenv(name) == 0);
 357     }
 358     return 0;
 359 }
 360
 361 #endif
 362
 363 /*---------------------------------------------------------------------------*/