lib/as3/files.c

   1 /* files.c
   2
   3    Extension module for the rfxswf library.
   4    Part of the swftools package.
   5
   6    Copyright (c) 2008 Matthias Kramm <kramm@quiss.org>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  21
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <stdarg.h>
  25 #include <memory.h>
  26 #include <errno.h>
  27 #include "files.h"
  28 #include "tokenizer.h"
  29
  30 static int verbose = 0;
  31 static void dbg(const char*format, ...)
  32 {
  33     char buf[1024];
  34     int l;
  35     va_list arglist;
  36     if(!verbose)
  37         return;
  38     va_start(arglist, format);
  39     vsprintf(buf, format, arglist);
  40     va_end(arglist);
  41     l = strlen(buf);
  42     while(l && buf[l-1]=='\n') {
  43         buf[l-1] = 0;
  44         l--;
  45     }
  46     printf("(includefilehandler) ");
  47     printf("%s\n", buf);
  48     fflush(stdout);
  49 }
  50
  51
  52 typedef struct _include_dir {
  53     char*path;
  54     struct _include_dir*next;
  55 } include_dir_t;
  56
  57 int current_line=1;
  58 int current_column=0;
  59 char* current_filename=0;
  60 char* current_filename_short=0;
  61 include_dir_t* current_include_dirs=0;
  62
  63 #define MAX_INCLUDE_DEPTH 16
  64
  65 void*include_stack[MAX_INCLUDE_DEPTH];
  66 int line_stack[MAX_INCLUDE_DEPTH];
  67 int column_stack[MAX_INCLUDE_DEPTH];
  68 char* filename_stack[MAX_INCLUDE_DEPTH];
  69 char* shortfilename_stack[MAX_INCLUDE_DEPTH];
  70 include_dir_t* includedir_stack[MAX_INCLUDE_DEPTH];
  71 int include_stack_ptr = 0;
  72
  73 void add_include_dir(char*dir)
  74 {
  75     include_dir_t*d = malloc(sizeof(include_dir_t));
  76     memset(d , 0, sizeof(include_dir_t));
  77     d->path = dir;
  78     d->next = current_include_dirs;
  79     current_include_dirs = d;
  80 }
  81 char*get_path(char*file)
  82 {
  83     char*path = strdup(file);
  84     char*r1 = strrchr(path, '/');
  85     char*r2 = strrchr(path, '\\');
  86     if(r1<r2) {
  87         *r2=0;
  88         return path;
  89     } else if(r1>r2) {
  90         *r1=0;
  91         return path;
  92     } else {
  93         return strdup(".");
  94     }
  95 }
  96 char* concat_paths(const char*base, const char*add)
  97 {
  98     int l1 = strlen(base);
  99     int l2 = strlen(add);
 100     int pos = 0;
 101     char*n = 0;
 102     while(l1 && base[l1-1] == '/')
 103         l1--;
 104     while(pos < l2 && add[pos] == '/')
 105         pos++;
 106     n = (char*)malloc(l1 + (l2-pos) + 2);
 107     memcpy(n,base,l1);
 108     n[l1]='/';
 109     memcpy(&n[l1+1],&add[pos],l2-pos+1);
 110     return n;
 111 }
 112 char is_absolute(char*filename)
 113 {
 114     if(!filename || !filename[0])
 115         return 0;
 116     if(filename[0]=='/' || filename[0]=='\\')
 117         return 1;
 118     if(filename[1]==':' && filename[1]=='/')
 119         return 1;
 120     if(filename[1]==':' && filename[1]=='\\')
 121         return 1;
 122     return 0;
 123 }
 124 char*find_file(char*filename)
 125 {
 126     include_dir_t*i = current_include_dirs;
 127     FILE*fi = 0;
 128     if(is_absolute(filename)) {
 129         FILE*fi = fopen(filename, "rb");
 130         if(fi) {
 131             fclose(fi);
 132             return strdup(filename);
 133         }
 134         return 0;
 135     }
 136     if(!i) {
 137         as3_warning("Include directory stack is empty, while looking for file %s", filename);
 138     }
 139     while(i) {
 140         char*p = concat_paths(i->path, filename);
 141         fi = fopen(p, "rb");
 142         if(fi) {
 143             fclose(fi);
 144             return p;
 145         }
 146         i = i->next;
 147     }
 148     return 0;
 149 }
 150
 151 char*enter_file(char*filename, void*state)
 152 {
 153     filename = strdup(filename);
 154
 155     if(include_stack_ptr >= MAX_INCLUDE_DEPTH) {
 156         as3_error("Includes nested too deeply");
 157         exit(1);
 158     }
 159     char*fullfilename = find_file(filename);
 160     if(!fullfilename) {
 161         as3_error("Couldn't find file %s", filename);
 162         include_dir_t*i = current_include_dirs;
 163         while(i) {
 164             fprintf(stderr, "include dir: %s\n", i->path);
 165             i = i->next;
 166         }
 167         exit(1);
 168     }
 169     include_stack[include_stack_ptr] = state;
 170     line_stack[include_stack_ptr] = current_line;
 171     column_stack[include_stack_ptr] = current_column;
 172     shortfilename_stack[include_stack_ptr] = current_filename_short;
 173     filename_stack[include_stack_ptr] = current_filename;
 174     includedir_stack[include_stack_ptr] = current_include_dirs;
 175     add_include_dir(get_path(fullfilename));
 176     include_stack_ptr++;
 177
 178     dbg("entering file %s", fullfilename);
 179
 180     current_line=1;
 181     current_column=0;
 182     current_filename = fullfilename;
 183     current_filename_short = filename;
 184     return fullfilename;
 185 }
 186
 187 FILE*enter_file2(char*filename, void*state)
 188 {
 189     char*fullfilename = enter_file(filename, state);
 190     FILE*fi = fopen(fullfilename, "rb");
 191     if(!fi) {
 192         as3_error("Couldn't find file %s: %s", fullfilename, strerror(errno));
 193     }
 194     return fi;
 195 }
 196
 197
 198 void* leave_file()
 199 {
 200     dbg("leaving file %s", current_filename);
 201     if(--include_stack_ptr<=0) {
 202         return 0;
 203     } else {
 204         free(current_filename);current_filename = filename_stack[include_stack_ptr];
 205         free(current_filename_short);current_filename_short = shortfilename_stack[include_stack_ptr];
 206         current_column = column_stack[include_stack_ptr];
 207         current_line = line_stack[include_stack_ptr];
 208         current_include_dirs = includedir_stack[include_stack_ptr];
 209         return include_stack[include_stack_ptr];
 210     }
 211 }