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199
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1 /*
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2
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3 TiMidity -- Experimental MIDI to WAVE converter
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4 Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
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5
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6 This program is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; if not, write to the Free Software
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18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19
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20 common.c
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21
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22 */
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23
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24 #if HAVE_CONFIG_H
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25 # include <config.h>
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26 #endif
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27
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <string.h>
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31
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32 #include "SDL_sound.h"
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33
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34 #define __SDL_SOUND_INTERNAL__
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35 #include "SDL_sound_internal.h"
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36
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37 #include "options.h"
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38 #include "common.h"
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39
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40 /* The paths in this list will be tried whenever we're reading a file */
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41 static PathList *pathlist = NULL; /* This is a linked list */
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42
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43 /* This is meant to find and open files for reading */
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44 SDL_RWops *open_file(char *name)
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45 {
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46 SDL_RWops *rw;
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47
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48 if (!name || !(*name))
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49 {
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50 SNDDBG(("Attempted to open nameless file.\n"));
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51 return 0;
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52 }
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53
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54 /* First try the given name */
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55
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56 SNDDBG(("Trying to open %s\n", name));
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57 if ((rw = SDL_RWFromFile(name, "rb")))
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58 return rw;
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59
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60 if (name[0] != PATH_SEP)
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61 {
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62 char current_filename[1024];
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63 PathList *plp = pathlist;
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64 int l;
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65
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66 while (plp) /* Try along the path then */
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67 {
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68 *current_filename = 0;
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69 l = strlen(plp->path);
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70 if(l)
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71 {
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72 strcpy(current_filename, plp->path);
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73 if(current_filename[l - 1] != PATH_SEP)
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74 {
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75 current_filename[l] = PATH_SEP;
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76 current_filename[l + 1] = '\0';
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77 }
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78 }
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79 strcat(current_filename, name);
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80 SNDDBG(("Trying to open %s\n", current_filename));
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81 if ((rw = SDL_RWFromFile(current_filename, "rb")))
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82 return rw;
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83 plp = plp->next;
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84 }
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85 }
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86
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87 /* Nothing could be opened. */
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88 SNDDBG(("Could not open %s\n", name));
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89 return 0;
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90 }
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91
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92 /* This'll allocate memory or die. */
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93 void *safe_malloc(size_t count)
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94 {
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95 void *p;
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96
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97 p = malloc(count);
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98 if (p == NULL)
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99 SNDDBG(("Sorry. Couldn't malloc %d bytes.\n", count));
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100
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101 return p;
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102 }
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103
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104 /* This adds a directory to the path list */
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105 void add_to_pathlist(char *s)
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106 {
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107 PathList *plp = safe_malloc(sizeof(PathList));
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108
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109 if (plp == NULL)
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110 return;
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111
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112 plp->path = safe_malloc(strlen(s) + 1);
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113 if (plp->path == NULL)
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114 return;
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115
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116 strcpy(plp->path, s);
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117 plp->next = pathlist;
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118 pathlist = plp;
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119 }
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120
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121 void free_pathlist(void)
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122 {
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123 PathList *plp = pathlist;
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124 PathList *next;
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125
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126 while (plp)
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127 {
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128 next = plp->next;
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129 free(plp);
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130 plp = next;
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131 }
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132 }
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