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f7deaa1a | 1 | /* |
75bd9771 | 2 | * "$Id: error.c 7460 2008-04-16 02:19:54Z mike $" |
f7deaa1a | 3 | * |
4 | * Raster error handling for the Common UNIX Printing System (CUPS). | |
5 | * | |
ae71f5de | 6 | * Copyright 2007-2008 by Apple Inc. |
f7deaa1a | 7 | * Copyright 2007 by Easy Software Products. |
8 | * | |
9 | * These coded instructions, statements, and computer programs are the | |
bc44d920 | 10 | * property of Apple Inc. and are protected by Federal copyright |
11 | * law. Distribution and use rights are outlined in the file "LICENSE.txt" | |
12 | * which should have been included with this file. If this file is | |
13 | * file is missing or damaged, see the license at "http://www.cups.org/". | |
f7deaa1a | 14 | * |
15 | * This file is subject to the Apple OS-Developed Software exception. | |
16 | * | |
17 | * Contents: | |
18 | * | |
19 | * _cupsRasterAddError() - Add an error message to the error buffer. | |
20 | * _cupsRasterClearError() - Clear the error buffer. | |
21 | * cupsRasterErrorString() - Return the last error from a raster function. | |
22 | * get_error_buffer() - Return a pointer to thread local storage. | |
23 | * raster_init() - Initialize error buffer once. | |
24 | * raster_destructor() - Free memory allocated by get_error_buffer(). | |
25 | */ | |
26 | ||
27 | /* | |
28 | * Include necessary headers... | |
29 | */ | |
30 | ||
31 | #include "image-private.h" | |
32 | #include <stdarg.h> | |
33 | ||
34 | ||
35 | /* | |
36 | * Local structures... | |
37 | */ | |
38 | ||
39 | typedef struct _cups_raster_error_s /**** Error buffer structure ****/ | |
40 | { | |
41 | char *start, /* Start of buffer */ | |
42 | *current, /* Current position in buffer */ | |
43 | *end; /* End of buffer */ | |
44 | } _cups_raster_error_t; | |
45 | ||
46 | ||
47 | /* | |
48 | * Local functions... | |
49 | */ | |
50 | ||
51 | static _cups_raster_error_t *get_error_buffer(void); | |
52 | ||
53 | ||
54 | /* | |
55 | * '_cupsRasterAddError()' - Add an error message to the error buffer. | |
56 | */ | |
57 | ||
58 | void | |
59 | _cupsRasterAddError(const char *f, /* I - Printf-style error message */ | |
60 | ...) /* I - Additional arguments as needed */ | |
61 | { | |
62 | _cups_raster_error_t *buf = get_error_buffer(); | |
63 | /* Error buffer */ | |
64 | va_list ap; /* Pointer to additional arguments */ | |
65 | char s[2048]; /* Message string */ | |
66 | size_t bytes; /* Bytes in message string */ | |
67 | ||
68 | ||
69 | va_start(ap, f); | |
70 | bytes = vsnprintf(s, sizeof(s), f, ap); | |
71 | va_end(ap); | |
72 | ||
73 | if (bytes <= 0) | |
74 | return; | |
75 | ||
76 | bytes ++; | |
77 | ||
78 | if (bytes >= sizeof(s)) | |
79 | return; | |
80 | ||
81 | if (bytes > (buf->end - buf->current)) | |
82 | { | |
83 | /* | |
84 | * Allocate more memory... | |
85 | */ | |
86 | ||
87 | char *temp; /* New buffer */ | |
88 | size_t size; /* Size of buffer */ | |
89 | ||
90 | ||
91 | size = buf->end - buf->start + 2 * bytes + 1024; | |
92 | ||
93 | if (buf->start) | |
94 | temp = realloc(buf->start, size); | |
95 | else | |
96 | temp = malloc(size); | |
97 | ||
98 | if (!temp) | |
99 | return; | |
100 | ||
101 | /* | |
102 | * Update pointers... | |
103 | */ | |
104 | ||
105 | buf->end = temp + size; | |
106 | buf->current = temp + (buf->current - buf->start); | |
107 | buf->start = temp; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Append the message to the end of the current string... | |
112 | */ | |
113 | ||
114 | memcpy(buf->current, s, bytes); | |
115 | buf->current += bytes - 1; | |
116 | } | |
117 | ||
118 | ||
119 | /* | |
120 | * '_cupsRasterClearError()' - Clear the error buffer. | |
121 | */ | |
122 | ||
123 | void | |
124 | _cupsRasterClearError(void) | |
125 | { | |
126 | _cups_raster_error_t *buf = get_error_buffer(); | |
127 | /* Error buffer */ | |
128 | ||
129 | ||
130 | buf->current = buf->start; | |
131 | ||
132 | if (buf->start) | |
133 | *(buf->start) = '\0'; | |
134 | } | |
135 | ||
136 | ||
137 | /* | |
138 | * 'cupsRasterErrorString()' - Return the last error from a raster function. | |
139 | * | |
140 | * If there are no recent errors, NULL is returned. | |
141 | * | |
142 | * @since CUPS 1.3@ | |
143 | */ | |
144 | ||
145 | const char * /* O - Last error */ | |
146 | cupsRasterErrorString(void) | |
147 | { | |
148 | _cups_raster_error_t *buf = get_error_buffer(); | |
149 | /* Error buffer */ | |
150 | ||
151 | ||
152 | if (buf->current == buf->start) | |
153 | return (NULL); | |
154 | else | |
155 | return (buf->start); | |
156 | } | |
157 | ||
158 | ||
159 | #ifdef HAVE_PTHREAD_H | |
160 | /* | |
161 | * Implement per-thread globals... | |
162 | */ | |
163 | ||
164 | # include <pthread.h> | |
165 | ||
166 | ||
167 | /* | |
168 | * Local globals... | |
169 | */ | |
170 | ||
171 | static pthread_key_t raster_key = -1; | |
172 | /* Thread local storage key */ | |
173 | static pthread_once_t raster_key_once = PTHREAD_ONCE_INIT; | |
174 | /* One-time initialization object */ | |
175 | ||
176 | ||
177 | /* | |
178 | * Local functions... | |
179 | */ | |
180 | ||
181 | static void raster_init(void); | |
182 | static void raster_destructor(void *value); | |
183 | ||
184 | ||
185 | /* | |
186 | * 'get_error_buffer()' - Return a pointer to thread local storage. | |
187 | */ | |
188 | ||
189 | _cups_raster_error_t * /* O - Pointer to error buffer */ | |
190 | get_error_buffer(void) | |
191 | { | |
192 | _cups_raster_error_t *buf; /* Pointer to error buffer */ | |
193 | ||
194 | ||
195 | /* | |
196 | * Initialize the global data exactly once... | |
197 | */ | |
198 | ||
ae71f5de | 199 | DEBUG_puts("get_error_buffer()"); |
f7deaa1a | 200 | |
201 | pthread_once(&raster_key_once, raster_init); | |
202 | ||
203 | /* | |
204 | * See if we have allocated the data yet... | |
205 | */ | |
206 | ||
207 | if ((buf = (_cups_raster_error_t *)pthread_getspecific(raster_key)) | |
208 | == NULL) | |
209 | { | |
210 | DEBUG_puts("get_error_buffer: allocating memory for thread..."); | |
211 | ||
212 | /* | |
213 | * No, allocate memory as set the pointer for the key... | |
214 | */ | |
215 | ||
216 | buf = calloc(1, sizeof(_cups_raster_error_t)); | |
217 | pthread_setspecific(raster_key, buf); | |
218 | ||
219 | DEBUG_printf((" buf=%p\n", buf)); | |
220 | } | |
221 | ||
222 | /* | |
223 | * Return the pointer to the data... | |
224 | */ | |
225 | ||
226 | return (buf); | |
227 | } | |
228 | ||
229 | ||
230 | /* | |
231 | * 'raster_init()' - Initialize error buffer once. | |
232 | */ | |
233 | ||
234 | static void | |
235 | raster_init(void) | |
236 | { | |
237 | pthread_key_create(&raster_key, raster_destructor); | |
238 | ||
ae71f5de MS |
239 | DEBUG_printf(("raster_init(): raster_key=%x(%u)\n", (unsigned)raster_key, |
240 | (unsigned)raster_key)); | |
f7deaa1a | 241 | } |
242 | ||
243 | ||
244 | /* | |
245 | * 'raster_destructor()' - Free memory allocated by get_error_buffer(). | |
246 | */ | |
247 | ||
248 | static void | |
249 | raster_destructor(void *value) /* I - Data to free */ | |
250 | { | |
251 | _cups_raster_error_t *buf = (_cups_raster_error_t *)value; | |
252 | /* Error buffer */ | |
253 | ||
254 | ||
255 | DEBUG_printf(("raster_destructor(value=%p)\n", value)); | |
256 | ||
257 | if (buf->start) | |
258 | free(buf->start); | |
259 | ||
260 | free(value); | |
261 | } | |
262 | ||
263 | ||
264 | #else | |
265 | /* | |
266 | * Implement static globals... | |
267 | */ | |
268 | ||
269 | /* | |
270 | * 'get_error_buffer()' - Return a pointer to thread local storage. | |
271 | */ | |
272 | ||
273 | _cups_raster_error_t * /* O - Pointer to error buffer */ | |
274 | get_error_buffer(void) | |
275 | { | |
276 | static _cups_raster_error_t buf = { 0, 0, 0 }; | |
277 | /* Error buffer */ | |
278 | ||
279 | ||
280 | return (&buf); | |
281 | } | |
282 | #endif /* HAVE_PTHREAD_H */ | |
283 | ||
284 | ||
285 | /* | |
75bd9771 | 286 | * End of "$Id: error.c 7460 2008-04-16 02:19:54Z mike $". |
f7deaa1a | 287 | */ |