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annotate src/SDL_error.c @ 1702:a7ad7081b977 SDL-1.3

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Merged Ryan's 5.1 audio fix from SDL 1.2
author Sam Lantinga <slouken@libsdl.org>
date Fri, 23 Jun 2006 09:01:08 +0000
parents 4da1ee79c9af
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Simple error handling in SDL */
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25
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26 #include "SDL_error.h"
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27 #include "SDL_error_c.h"
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28
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29 /* Routine to get the thread-specific error variable */
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30 #if SDL_THREADS_DISABLED
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31 /* The SDL_arraysize(The ),default (non-thread-safe) global error variable */
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32 static SDL_error SDL_global_error;
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33 #define SDL_GetErrBuf() (&SDL_global_error)
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34 #else
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35 extern SDL_error *SDL_GetErrBuf(void);
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36 #endif /* SDL_THREADS_DISABLED */
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37
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38 #define SDL_ERRBUFIZE 1024
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39
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40 /* Private functions */
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41
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42 static const char *
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43 SDL_LookupString(const char *key)
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44 {
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45 /* FIXME: Add code to lookup key in language string hash-table */
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46 return key;
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47 }
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48
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49 /* Public functions */
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50
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51 void
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52 SDL_SetError(const char *fmt, ...)
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53 {
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54 va_list ap;
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55 SDL_error *error;
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56
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57 /* Copy in the key, mark error as valid */
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58 error = SDL_GetErrBuf();
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59 error->error = 1;
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60 SDL_strlcpy((char *) error->key, fmt, sizeof(error->key));
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61
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62 va_start(ap, fmt);
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63 error->argc = 0;
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64 while (*fmt) {
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65 if (*fmt++ == '%') {
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66 while (*fmt == '.' || (*fmt >= '0' && *fmt <= '9')) {
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67 ++fmt;
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68 }
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69 switch (*fmt++) {
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70 case 0: /* Malformed format string.. */
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71 --fmt;
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72 break;
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73 case 'c':
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74 case 'i':
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75 case 'd':
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76 case 'u':
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77 case 'o':
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78 case 'x':
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79 case 'X':
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80 error->args[error->argc++].value_i = va_arg(ap, int);
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81 break;
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82 case 'f':
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83 error->args[error->argc++].value_f = va_arg(ap, double);
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84 break;
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85 case 'p':
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86 error->args[error->argc++].value_ptr = va_arg(ap, void *);
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87 break;
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88 case 's':
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89 {
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90 int i = error->argc;
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91 const char *str = va_arg(ap, const char *);
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92 if (str == NULL)
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93 str = "(null)";
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94 SDL_strlcpy((char *) error->args[i].buf, str,
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95 ERR_MAX_STRLEN);
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96 error->argc++;
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97 }
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98 break;
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99 default:
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100 break;
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101 }
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102 if (error->argc >= ERR_MAX_ARGS) {
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103 break;
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104 }
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105 }
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106 }
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107 va_end(ap);
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108
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109 /* If we are in debug mode, print out an error message */
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110 #ifdef DEBUG_ERROR
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111 fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError());
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112 #endif
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113 }
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114
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115 /* This function has a bit more overhead than most error functions
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116 so that it supports internationalization and thread-safe errors.
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117 */
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118 char *
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119 SDL_GetErrorMsg(char *errstr, unsigned int maxlen)
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120 {
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121 SDL_error *error;
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122
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123 /* Clear the error string */
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124 *errstr = '\0';
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125 --maxlen;
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126
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127 /* Get the thread-safe error, and print it out */
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128 error = SDL_GetErrBuf();
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129 if (error->error) {
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130 const char *fmt;
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131 char *msg = errstr;
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132 int len;
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133 int argi;
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134
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135 fmt = SDL_LookupString(error->key);
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136 argi = 0;
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137 while (*fmt && (maxlen > 0)) {
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138 if (*fmt == '%') {
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139 char tmp[32], *spot = tmp;
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140 *spot++ = *fmt++;
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141 while ((*fmt == '.' || (*fmt >= '0' && *fmt <= '9'))
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142 && spot < (tmp + SDL_arraysize(tmp) - 2)) {
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143 *spot++ = *fmt++;
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144 }
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145 *spot++ = *fmt++;
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146 *spot++ = '\0';
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147 switch (spot[-2]) {
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148 case '%':
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149 *msg++ = '%';
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150 maxlen -= 1;
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151 break;
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152 case 'c':
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153 case 'i':
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154 case 'd':
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155 case 'u':
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156 case 'o':
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157 case 'x':
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158 case 'X':
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159 len =
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160 SDL_snprintf(msg, maxlen, tmp,
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161 error->args[argi++].value_i);
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162 msg += len;
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163 maxlen -= len;
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164 break;
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165 case 'f':
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166 len =
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167 SDL_snprintf(msg, maxlen, tmp,
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168 error->args[argi++].value_f);
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169 msg += len;
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170 maxlen -= len;
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171 break;
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172 case 'p':
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173 len =
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174 SDL_snprintf(msg, maxlen, tmp,
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175 error->args[argi++].value_ptr);
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176 msg += len;
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177 maxlen -= len;
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178 break;
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179 case 's':
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180 len =
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181 SDL_snprintf(msg, maxlen, tmp,
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182 SDL_LookupString(error->
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183 args[argi++].buf));
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184 msg += len;
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185 maxlen -= len;
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186 break;
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187 }
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188 } else {
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189 *msg++ = *fmt++;
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190 maxlen -= 1;
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191 }
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192 }
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193 *msg = 0; /* NULL terminate the string */
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194 }
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195 return (errstr);
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196 }
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197
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198 /* Available for backwards compatibility */
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199 char *
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200 SDL_GetError(void)
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201 {
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202 static char errmsg[SDL_ERRBUFIZE];
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203
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204 return ((char *) SDL_GetErrorMsg(errmsg, SDL_ERRBUFIZE));
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205 }
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206
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207 void
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208 SDL_ClearError(void)
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209 {
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210 SDL_error *error;
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211
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212 error = SDL_GetErrBuf();
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213 error->error = 0;
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214 }
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215
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216 /* Very common errors go here */
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217 void
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218 SDL_Error(SDL_errorcode code)
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219 {
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220 switch (code) {
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221 case SDL_ENOMEM:
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222 SDL_SetError("Out of memory");
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223 break;
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224 case SDL_EFREAD:
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225 SDL_SetError("Error reading from datastream");
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226 break;
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227 case SDL_EFWRITE:
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228 SDL_SetError("Error writing to datastream");
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229 break;
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230 case SDL_EFSEEK:
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231 SDL_SetError("Error seeking in datastream");
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232 break;
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233 default:
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234 SDL_SetError("Unknown SDL error");
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235 break;
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236 }
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237 }
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238
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239 #ifdef TEST_ERROR
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240 int
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241 main(int argc, char *argv[])
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242 {
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243 char buffer[BUFSIZ + 1];
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244
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245 SDL_SetError("Hi there!");
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246 printf("Error 1: %s\n", SDL_GetError());
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247 SDL_ClearError();
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248 SDL_memset(buffer, '1', BUFSIZ);
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249 buffer[BUFSIZ] = 0;
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250 SDL_SetError("This is the error: %s (%f)", buffer, 1.0);
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251 printf("Error 2: %s\n", SDL_GetError());
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252 exit(0);
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253 }
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254 #endif
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255 /* vi: set ts=4 sw=4 expandtab: */