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annotate paths.c @ 1680:326d1a601fb9

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Fixed crash bug that could occur in a narrow window of time when loading a ROM
author Michael Pavone <pavone@retrodev.com>
date Thu, 17 Jan 2019 10:00:24 -0800
parents ab3b465c052c
children dda7479f3bbb
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1 #include <string.h>
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2 #include <stdlib.h>
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3 #include "blastem.h"
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4 #include "util.h"
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5
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6 static char **current_path;
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7
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8 static void persist_path(void)
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9 {
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10 char *pathfname = alloc_concat(get_userdata_dir(), PATH_SEP "blastem" PATH_SEP "sticky_path");
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11 FILE *f = fopen(pathfname, "wb");
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12 if (f) {
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13 if (fwrite(*current_path, 1, strlen(*current_path), f) != strlen(*current_path)) {
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14 warning("Failed to save menu path");
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15 }
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16 fclose(f);
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17 } else {
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18 warning("Failed to save menu path: Could not open %s for writing\n", pathfname);
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19
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20 }
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21 free(pathfname);
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22 }
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23
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24 #ifdef __ANDROID__
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25 #include <SDL.h>
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26 #include <jni.h>
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27 static char *get_external_storage_path()
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28 {
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29 static char *ret;
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30 if (ret) {
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31 return ret;
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32 }
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33 JNIEnv *env = SDL_AndroidGetJNIEnv();
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34 if ((*env)->PushLocalFrame(env, 8) < 0) {
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35 return NULL;
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36 }
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37
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38 jclass Environment = (*env)->FindClass(env, "android/os/Environment");
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39 jmethodID getExternalStorageDirectory =
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40 (*env)->GetStaticMethodID(env, Environment, "getExternalStorageDirectory", "()Ljava/io/File;");
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41 jobject file = (*env)->CallStaticObjectMethod(env, Environment, getExternalStorageDirectory);
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42 if (!file) {
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43 goto cleanup;
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44 }
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45
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46 jmethodID getAbsolutePath = (*env)->GetMethodID(env, (*env)->GetObjectClass(env, file),
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47 "getAbsolutePath", "()Ljava/lang/String;");
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48 jstring path = (*env)->CallObjectMethod(env, file, getAbsolutePath);
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49
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50 char const *tmp = (*env)->GetStringUTFChars(env, path, NULL);
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51 ret = strdup(tmp);
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52 (*env)->ReleaseStringUTFChars(env, path, tmp);
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53
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54 cleanup:
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55 (*env)->PopLocalFrame(env, NULL);
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56 return ret;
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57 }
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58 #endif
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59
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60 void get_initial_browse_path(char **dst)
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61 {
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62 *dst = NULL;
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63 char *remember_path = tern_find_path(config, "ui\0remember_path\0", TVAL_PTR).ptrval;
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64 if (!remember_path || !strcmp("on", remember_path)) {
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65 char *pathfname = alloc_concat(get_userdata_dir(), PATH_SEP "blastem" PATH_SEP "sticky_path");
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66 FILE *f = fopen(pathfname, "rb");
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67 if (f) {
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68 long pathsize = file_size(f);
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69 if (pathsize > 0) {
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70 *dst = malloc(pathsize + 1);
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71 if (fread(*dst, 1, pathsize, f) != pathsize) {
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72 warning("Error restoring saved file browser path");
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73 free(*dst);
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74 *dst = NULL;
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75 } else {
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76 (*dst)[pathsize] = 0;
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77 }
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78 }
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79 fclose(f);
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80 }
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81 free(pathfname);
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82 if (!current_path) {
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83 atexit(persist_path);
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84 current_path = dst;
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85 }
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86 }
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87 if (!*dst) {
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88 *dst = tern_find_path(config, "ui\0initial_path\0", TVAL_PTR).ptrval;
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89 }
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90 if (!*dst){
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91 #ifdef __ANDROID__
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92 *dst = get_external_storage_path();
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93 #else
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94 *dst = "$HOME";
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95 #endif
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96 }
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97 tern_node *vars = tern_insert_ptr(NULL, "HOME", get_home_dir());
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98 vars = tern_insert_ptr(vars, "EXEDIR", get_exe_dir());
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99 *dst = replace_vars(*dst, vars, 1);
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100 tern_free(vars);
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101 }
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102
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103 char *path_append(const char *base, const char *suffix)
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104 {
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105 if (!strcmp(suffix, "..")) {
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106 #ifdef _WIN32
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107 //handle transition from root of a drive to virtual root
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108 if (base[1] == ':' && !base[2]) {
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109 return strdup(PATH_SEP);
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110 }
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111 #endif
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112 size_t len = strlen(base);
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113 while (len > 0) {
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114 --len;
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115 if (is_path_sep(base[len])) {
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116 if (!len) {
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117 //special handling for /
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118 len++;
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119 }
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120 char *ret = malloc(len+1);
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121 memcpy(ret, base, len);
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122 ret[len] = 0;
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123 return ret;
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124 }
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125 }
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126 return strdup(PATH_SEP);
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127 } else {
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128 #ifdef _WIN32
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129 if (base[0] == PATH_SEP[0] && !base[1]) {
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130 //handle transition from virtual root to root of a drive
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131 return strdup(suffix);
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132 }
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133 #endif
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134 if (is_path_sep(base[strlen(base) - 1])) {
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135 return alloc_concat(base, suffix);
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136 } else {
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137 char const *pieces[] = {base, PATH_SEP, suffix};
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138 return alloc_concat_m(3, pieces);
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139 }
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140 }
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141 }