Mercurial > sdl-ios-xcode
comparison src/SDL_error.c @ 0:74212992fb08
Initial revision
author | Sam Lantinga <slouken@lokigames.com> |
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date | Thu, 26 Apr 2001 16:45:43 +0000 |
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children | cf2af46e9e2a |
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1 /* | |
2 SDL - Simple DirectMedia Layer | |
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga | |
4 | |
5 This library is free software; you can redistribute it and/or | |
6 modify it under the terms of the GNU Library General Public | |
7 License as published by the Free Software Foundation; either | |
8 version 2 of the License, or (at your option) any later version. | |
9 | |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 Library General Public License for more details. | |
14 | |
15 You should have received a copy of the GNU Library General Public | |
16 License along with this library; if not, write to the Free | |
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | |
19 Sam Lantinga | |
20 slouken@devolution.com | |
21 */ | |
22 | |
23 #ifdef SAVE_RCSID | |
24 static char rcsid = | |
25 "@(#) $Id$"; | |
26 #endif | |
27 | |
28 /* Simple error handling in SDL */ | |
29 | |
30 #include <stdio.h> | |
31 #include <stdlib.h> | |
32 #include <stdarg.h> | |
33 #include <string.h> | |
34 | |
35 #include "SDL_types.h" | |
36 #include "SDL_getenv.h" | |
37 #include "SDL_error.h" | |
38 #include "SDL_error_c.h" | |
39 #ifndef DISABLE_THREADS | |
40 #include "SDL_thread_c.h" | |
41 #endif | |
42 | |
43 #ifdef DISABLE_THREADS | |
44 /* The default (non-thread-safe) global error variable */ | |
45 static SDL_error SDL_global_error; | |
46 | |
47 #define SDL_GetErrBuf() (&SDL_global_error) | |
48 #endif /* DISABLE_THREADS */ | |
49 | |
50 #define SDL_ERRBUFIZE 1024 | |
51 | |
52 /* Private functions */ | |
53 | |
54 static void SDL_LookupString(const Uint8 *key, Uint16 *buf, int buflen) | |
55 { | |
56 /* FIXME: Add code to lookup key in language string hash-table */ | |
57 | |
58 /* Key not found in language string hash-table */ | |
59 while ( *key && (--buflen > 0) ) { | |
60 *buf++ = *key++; | |
61 } | |
62 *buf = 0; /* NULL terminate string */ | |
63 } | |
64 | |
65 /* Public functions */ | |
66 | |
67 void SDL_SetError (const char *fmt, ...) | |
68 { | |
69 va_list ap; | |
70 SDL_error *error; | |
71 | |
72 /* Copy in the key, mark error as valid */ | |
73 error = SDL_GetErrBuf(); | |
74 error->error = 1; | |
75 strncpy((char *)error->key, fmt, sizeof(error->key)); | |
76 error->key[sizeof(error->key)-1] = '\0'; | |
77 | |
78 va_start(ap, fmt); | |
79 error->argc = 0; | |
80 while ( *fmt ) { | |
81 if ( *fmt++ == '%' ) { | |
82 switch (*fmt++) { | |
83 case 0: /* Malformed format string.. */ | |
84 --fmt; | |
85 break; | |
86 #if 0 /* What is a character anyway? (UNICODE issues) */ | |
87 case 'c': | |
88 error->args[error->argc++].value_c = | |
89 va_arg(ap, unsigned char); | |
90 break; | |
91 #endif | |
92 case 'd': | |
93 error->args[error->argc++].value_i = | |
94 va_arg(ap, int); | |
95 break; | |
96 case 'f': | |
97 error->args[error->argc++].value_f = | |
98 va_arg(ap, double); | |
99 break; | |
100 case 'p': | |
101 error->args[error->argc++].value_ptr = | |
102 va_arg(ap, void *); | |
103 break; | |
104 case 's': | |
105 { | |
106 int index = error->argc; | |
107 strncpy((char *)error->args[index].buf, | |
108 va_arg(ap, char *), ERR_MAX_STRLEN); | |
109 error->args[index].buf[ERR_MAX_STRLEN-1] = 0; | |
110 error->argc++; | |
111 } | |
112 break; | |
113 default: | |
114 break; | |
115 } | |
116 if ( error->argc >= ERR_MAX_ARGS ) { | |
117 break; | |
118 } | |
119 } | |
120 } | |
121 va_end(ap); | |
122 | |
123 /* If we are in debug mode, print out an error message */ | |
124 #ifdef DEBUG_ERROR | |
125 fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError()); | |
126 #else | |
127 if ( getenv("SDL_DEBUG") ) { | |
128 fprintf(stderr, "SDL_SetError: %s\n", SDL_GetError()); | |
129 } | |
130 #endif | |
131 } | |
132 | |
133 /* Print out an integer value to a UNICODE buffer */ | |
134 static int PrintInt(Uint16 *str, unsigned int maxlen, int value) | |
135 { | |
136 char tmp[128]; | |
137 int len, i; | |
138 | |
139 sprintf(tmp, "%d", value); | |
140 len = 0; | |
141 if ( strlen(tmp) < maxlen ) { | |
142 for ( i=0; tmp[i]; ++i ) { | |
143 *str++ = tmp[i]; | |
144 ++len; | |
145 } | |
146 } | |
147 return(len); | |
148 } | |
149 /* Print out a double value to a UNICODE buffer */ | |
150 static int PrintDouble(Uint16 *str, unsigned int maxlen, double value) | |
151 { | |
152 char tmp[128]; | |
153 int len, i; | |
154 | |
155 sprintf(tmp, "%f", value); | |
156 len = 0; | |
157 if ( strlen(tmp) < maxlen ) { | |
158 for ( i=0; tmp[i]; ++i ) { | |
159 *str++ = tmp[i]; | |
160 ++len; | |
161 } | |
162 } | |
163 return(len); | |
164 } | |
165 /* Print out a pointer value to a UNICODE buffer */ | |
166 static int PrintPointer(Uint16 *str, unsigned int maxlen, void *value) | |
167 { | |
168 char tmp[128]; | |
169 int len, i; | |
170 | |
171 sprintf(tmp, "%p", value); | |
172 len = 0; | |
173 if ( strlen(tmp) < maxlen ) { | |
174 for ( i=0; tmp[i]; ++i ) { | |
175 *str++ = tmp[i]; | |
176 ++len; | |
177 } | |
178 } | |
179 return(len); | |
180 } | |
181 | |
182 /* This function has a bit more overhead than most error functions | |
183 so that it supports internationalization and thread-safe errors. | |
184 */ | |
185 Uint16 *SDL_GetErrorMsgUNICODE(Uint16 *errstr, unsigned int maxlen) | |
186 { | |
187 SDL_error *error; | |
188 | |
189 /* Clear the error string */ | |
190 *errstr = 0; --maxlen; | |
191 | |
192 /* Get the thread-safe error, and print it out */ | |
193 error = SDL_GetErrBuf(); | |
194 if ( error->error ) { | |
195 Uint16 translated[ERR_MAX_STRLEN], *fmt, *msg; | |
196 int len; | |
197 int argi; | |
198 | |
199 /* Print out the UNICODE error message */ | |
200 SDL_LookupString(error->key, translated, sizeof(translated)); | |
201 msg = errstr; | |
202 argi = 0; | |
203 for ( fmt=translated; *fmt && (maxlen > 0); ) { | |
204 if ( *fmt == '%' ) { | |
205 switch (fmt[1]) { | |
206 case 'S': /* Special SKIP operand */ | |
207 argi += (fmt[2] - '0'); | |
208 ++fmt; | |
209 break; | |
210 case '%': | |
211 *msg++ = '%'; | |
212 maxlen -= 1; | |
213 break; | |
214 #if 0 /* What is a character anyway? (UNICODE issues) */ | |
215 case 'c': | |
216 *msg++ = (unsigned char) | |
217 error->args[argi++].value_c; | |
218 maxlen -= 1; | |
219 break; | |
220 #endif | |
221 case 'd': | |
222 len = PrintInt(msg, maxlen, | |
223 error->args[argi++].value_i); | |
224 msg += len; | |
225 maxlen -= len; | |
226 break; | |
227 case 'f': | |
228 len = PrintDouble(msg, maxlen, | |
229 error->args[argi++].value_f); | |
230 msg += len; | |
231 maxlen -= len; | |
232 break; | |
233 case 'p': | |
234 len = PrintPointer(msg, maxlen, | |
235 error->args[argi++].value_ptr); | |
236 msg += len; | |
237 maxlen -= len; | |
238 break; | |
239 case 's': /* UNICODE string */ | |
240 { Uint16 buf[ERR_MAX_STRLEN], *str; | |
241 SDL_LookupString(error->args[argi++].buf, buf, sizeof(buf)); | |
242 str = buf; | |
243 while ( *str && (maxlen > 0) ) { | |
244 *msg++ = *str++; | |
245 maxlen -= 1; | |
246 } | |
247 } | |
248 break; | |
249 } | |
250 fmt += 2; | |
251 } else { | |
252 *msg++ = *fmt++; | |
253 maxlen -= 1; | |
254 } | |
255 } | |
256 *msg = 0; /* NULL terminate the string */ | |
257 } | |
258 return(errstr); | |
259 } | |
260 | |
261 Uint8 *SDL_GetErrorMsg(Uint8 *errstr, unsigned int maxlen) | |
262 { | |
263 Uint16 *errstr16; | |
264 unsigned int i; | |
265 | |
266 /* Allocate the UNICODE buffer */ | |
267 errstr16 = (Uint16 *)malloc(maxlen * (sizeof *errstr16)); | |
268 if ( ! errstr16 ) { | |
269 strncpy((char *)errstr, "Out of memory", maxlen); | |
270 errstr[maxlen-1] = '\0'; | |
271 return(errstr); | |
272 } | |
273 | |
274 /* Get the error message */ | |
275 SDL_GetErrorMsgUNICODE(errstr16, maxlen); | |
276 | |
277 /* Convert from UNICODE to Latin1 encoding */ | |
278 for ( i=0; i<maxlen; ++i ) { | |
279 errstr[i] = (Uint8)errstr16[i]; | |
280 } | |
281 | |
282 /* Free UNICODE buffer (if necessary) */ | |
283 free(errstr16); | |
284 | |
285 return(errstr); | |
286 } | |
287 | |
288 /* Available for backwards compatibility */ | |
289 char *SDL_GetError (void) | |
290 { | |
291 static char errmsg[SDL_ERRBUFIZE]; | |
292 | |
293 return((char *)SDL_GetErrorMsg((unsigned char *)errmsg, SDL_ERRBUFIZE)); | |
294 } | |
295 | |
296 void SDL_ClearError(void) | |
297 { | |
298 SDL_error *error; | |
299 | |
300 error = SDL_GetErrBuf(); | |
301 error->error = 0; | |
302 } | |
303 | |
304 /* Very common errors go here */ | |
305 void SDL_Error(SDL_errorcode code) | |
306 { | |
307 switch (code) { | |
308 case SDL_ENOMEM: | |
309 SDL_SetError("Out of memory"); | |
310 break; | |
311 case SDL_EFREAD: | |
312 SDL_SetError("Error reading from datastream"); | |
313 break; | |
314 case SDL_EFWRITE: | |
315 SDL_SetError("Error writing to datastream"); | |
316 break; | |
317 case SDL_EFSEEK: | |
318 SDL_SetError("Error seeking in datastream"); | |
319 break; | |
320 default: | |
321 SDL_SetError("Unknown SDL error"); | |
322 break; | |
323 } | |
324 } | |
325 | |
326 #ifdef TEST_ERROR | |
327 int main(int argc, char *argv[]) | |
328 { | |
329 char buffer[BUFSIZ+1]; | |
330 | |
331 SDL_SetError("Hi there!"); | |
332 printf("Error 1: %s\n", SDL_GetError()); | |
333 SDL_ClearError(); | |
334 memset(buffer, '1', BUFSIZ); | |
335 buffer[BUFSIZ] = 0; | |
336 SDL_SetError("This is the error: %s (%f)", buffer, 1.0); | |
337 printf("Error 2: %s\n", SDL_GetError()); | |
338 exit(0); | |
339 } | |
340 #endif |