src/fileutil.c

   1 /*
   2   Copyright 1998-2003 Victor Wagner
   3   Copyright 2003 Alex Ott
   4   This file is released under the GPL.  Details can be
   5   found in the file COPYING accompanying this distribution.
   6 */
   7 #ifdef HAVE_CONFIG_H
   8 #include <config.h>
   9 #endif
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <sys/stat.h>
  14 #include <stdlib.h>
  15 #include "catdoc.h"
  16 #if defined(MSDOS) && !defined(__MSDOS__)
  17 #define __MSDOS__
  18 #endif
  19 #if defined(__MSDOS__) || defined(_WIN32)
  20 #include <dir.h>
  21 #include <dos.h>
  22 #else
  23 #include <glob.h>
  24 #endif
  25
  26
  27 /************************************************************************/
  28 /*  Copies component of string starting with p and ending one char      */
  29 /*  before q into path_buf, expanding ~ if neccessary                   */
  30 /************************************************************************/
  31 int prepare_path_buf(char *path_buf, const char *start, const char *end) {
  32         if (*start == '~' && start[1] == DIR_SEP) {
  33                 char *home=getenv("HOME");
  34                 start++;
  35                 if (!home) {
  36                         if (end-start>PATH_BUF_SIZE) return 0;
  37                         strncpy(path_buf,start,end-start);
  38                         path_buf[end-start]=0;
  39                 } else {
  40                         int l = strlen(home);
  41                         if (l+(end-start)>PATH_BUF_SIZE) return 0;
  42                         strcpy(path_buf,home);
  43                         strncpy(path_buf+l,start,end-start);
  44                         path_buf[end-start+l]=0;
  45                 }
  46         } else {
  47                         if (end-start>PATH_BUF_SIZE) return 0;
  48                         strncpy(path_buf,start,end-start);
  49                         path_buf[end-start]=0;
  50         }
  51         /* Empty list element means current directory */
  52         if (!*path_buf) {
  53                 path_buf[0]='.';
  54                 path_buf[1]=0;
  55 #ifdef __MSDOS__
  56         } else {
  57                 strcpy(path_buf,add_exe_path(path_buf)); /* safe, becouse
  58                                                                                                         add_exe_path knows about PATH_BUF_SIZE */
  59 #endif
  60         }
  61         return 1;
  62
  63 }
  64 /************************************************************************/
  65 /* Searches for file name in specified list of directories. Sets        */
  66 /* Returns dynamically allocated full path or NULL. if nothing          */
  67 /* appropriate   Expects name to be dynamically allocated and frees it  */
  68 /************************************************************************/
  69 char *find_file(char *name, const char *path)
  70 { const char *p;
  71         char *q;
  72         char path_buf[PATH_BUF_SIZE];
  73         char dir_sep[2]={DIR_SEP,0};
  74         for (p=path;p;p=q+1) {
  75                 q=strchr(p,LIST_SEP);
  76
  77                 if (q) {
  78                         if (!prepare_path_buf(path_buf,p,q)) continue;
  79                 } else {
  80                         q--;
  81                         if (!prepare_path_buf(path_buf,p,p+strlen(p))) continue;
  82                 }
  83                 strcat(path_buf,dir_sep); /* always one char */
  84                 if (strlen(path_buf)+strlen(name)>=PATH_BUF_SIZE)
  85                         continue; /* Ignore too deeply nested directories */
  86                 strcat(path_buf,name);
  87                 if (access(path_buf,0)==0) {
  88                         free(name);
  89                         return strdup(path_buf);
  90                 }
  91         }
  92         /* if we are here, nothing found */
  93         free(name);
  94         return NULL;
  95 }
  96
  97 /************************************************************************/
  98 /* Searches for charset with given name and put pointer to malloced copy*/
  99 /* of its name into first arg if found. Otherwise leaves first arg      */
 100 /*  unchanged. Returns non-zero on success                              */
 101 /************************************************************************/
 102 int check_charset(char **filename,const char *charset) {
 103         char *tmppath;
 104         if (!strncmp(charset,"utf-8",6)) {
 105                 *filename=strdup("utf-8");
 106                 return 1;
 107         }
 108         tmppath=find_file(stradd(charset,CHARSET_EXT),charset_path);
 109         if (tmppath&& *tmppath) {
 110                 *filename=strdup(charset);
 111                 free(tmppath);
 112                 return 1;
 113         }
 114         return 0;
 115 }
 116
 117 /**********************************************************************/
 118 /*  Returns malloced string containing concatenation of two           */
 119 /*  arguments                                                         */
 120 /**********************************************************************/
 121 char *stradd(const char *s1,const char *s2)
 122 { char *res;
 123         res=malloc(strlen(s1)+strlen(s2)+1);
 124         if (!res) {
 125                 fprintf (stderr,"Out of memory!");
 126                 exit(1);
 127         }
 128         strcpy(res,s1);
 129         strcat(res,s2);
 130         return res;
 131 }
 132
 133
 134 /*
 135  * In DOS, argv[0] contain full path to the program, and it is a custom
 136  * to keep configuration files in same directory as program itself
 137  */
 138 #ifdef __MSDOS__
 139 char *exe_dir(void) {
 140         static char pathbuf[PATH_BUF_SIZE];
 141         char *q;
 142         strcpy(pathbuf,_argv[0]); /* DOS ensures, that our exe path is no
 143                                                                  longer than PATH_BUF_SIZE*/
 144         q=strrchr(pathbuf,DIR_SEP);
 145         if (q) {
 146                 *q=0;
 147         } else {
 148                 pathbuf[0]=0;
 149         }
 150         return pathbuf;
 151 }
 152 char *add_exe_path(const char *name) {
 153         static char path[PATH_BUF_SIZE];
 154         char *mypath=exe_dir();
 155         /* No snprintf in Turbo C 2.0 library, so just check by hand
 156            and exit if something goes wrong */
 157         if (strchr(name,'%')) {
 158                 /* there is substitution */
 159                 if (strlen(name)-1+strlen(mypath)>=PATH_BUF_SIZE) {
 160                         fprintf(stderr,"Invalid config file. file name \"%s\" too long "
 161                                         "after substitution\n",name);
 162                         exit(1);
 163                 }
 164                 sprintf(path,name,exe_dir());
 165                 return path;
 166         } else {
 167                 return name;
 168         }
 169 }
 170 #endif
 171 /*********************************************************************/
 172 /* Prints out list of available charsets, i.e. names without extension *
 173  * of all .txt files in the charset path + internally-supported utf-8  *
 174  ************************************************************************/
 175
 176 void list_charsets(void) {
 177         const char *p;
 178         char *q;
 179         char path_buf[PATH_BUF_SIZE];
 180         char dir_sep[2]={DIR_SEP,0};
 181 #ifdef __MSDOS__
 182         struct ffblk ffblock;
 183         int res,col;
 184 #else
 185         glob_t glob_buf;
 186         int count,glob_flags=GLOB_ERR;
 187 #endif
 188         char **ptr;
 189         for (p=charset_path;p;p=q+1) {
 190                 q=strchr(p,LIST_SEP);
 191
 192                 if (q) {
 193                         if (q-p>=PATH_BUF_SIZE) {
 194                                 /* Oops, dir name too long, perhabs broken config file */
 195                                 continue;
 196                         }
 197                         strncpy(path_buf,p,q-p);
 198                         path_buf[q-p]=0;
 199                 } else {
 200                         q--;
 201                         if (strlen(p)>=PATH_BUF_SIZE) continue;
 202                         strcpy(path_buf,p);
 203                 }
 204                 /* Empty list element means current directory */
 205                 if (!*path_buf) {
 206                         path_buf[0]='.';
 207                         path_buf[1]=0;
 208 #ifdef __MSDOS__
 209                 } else {
 210                         strcpy(path_buf,add_exe_path(path_buf)); /* safe, becouse
 211                                                                                                                 add_exe_path knows about PATH_BUF_SIZE */
 212 #endif
 213                 }
 214                 strcat(path_buf,dir_sep); /* always one char */
 215                 if (strlen(path_buf)+6>=PATH_BUF_SIZE)
 216                         continue; /* Ignore too deeply nested directories */
 217                 strcat(path_buf,"*.txt");
 218 #ifdef __MSDOS__
 219                 res=findfirst(path_buf,&ffblock,FA_RDONLY | FA_HIDDEN | FA_ARCH);
 220                 col=1;
 221                 printf("Available charsets:\n");
 222                 while (!res) {
 223                         char name[12],*src,*dest;
 224                         dest=name;
 225                         src=ffblock.ff_name;
 226                         for (dest=name,src=ffblock.ff_name;*src && *src !='.';dest++,src++)
 227                                 *dest=tolower(*src);
 228                         *dest++=(col<5)?'\t':'\n';
 229                         if (++col>5) col=1;
 230                         *dest=0;
 231                         printf("%10s",name);
 232                         res=findnext(&ffblock);
 233                 }
 234 #else
 235                 switch (glob(path_buf,glob_flags,NULL,&glob_buf)) {
 236                         case 0:
 237 #ifdef GLOB_NOMATCH
 238                         case GLOB_NOMATCH:
 239 #endif
 240                                 break;
 241                         default:
 242                                 perror("catdoc");
 243                                 exit(1);
 244                 }
 245                 glob_flags|=GLOB_APPEND;
 246 #endif
 247         }
 248 #ifdef __MSDOS__
 249         fputs("utf-8\n",stdout);
 250 #else
 251         count=0;printf("Available charsets:");
 252         for (ptr=glob_buf.gl_pathv;*ptr;ptr++) {
 253                 printf("%c",(count++)%5?'\t':'\n');
 254                 p=strrchr(*ptr,dir_sep[0]);
 255                 if (!p) continue;
 256                 p++;
 257                 if ((q=strchr(p,'.'))) *q=0;
 258                 fputs(p,stdout);
 259         }
 260         printf("%c",(count++)%5?'\t':'\n');
 261         fputs("utf-8",stdout);
 262         printf("\n");
 263         globfree(&glob_buf);
 264 #endif
 265 }