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Commit | Line | Data |
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f7deaa1a | 1 | /* |
f2d18633 | 2 | * "$Id$" |
f7deaa1a | 3 | * |
7e86f2f6 | 4 | * Raster error handling for CUPS. |
f7deaa1a | 5 | * |
d9564ec7 | 6 | * Copyright 2007-2015 by Apple Inc. |
7e86f2f6 | 7 | * Copyright 2007 by Easy Software Products. |
f7deaa1a | 8 | * |
7e86f2f6 MS |
9 | * These coded instructions, statements, and computer programs are the |
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 | * |
7e86f2f6 | 15 | * This file is subject to the Apple OS-Developed Software exception. |
f7deaa1a | 16 | */ |
17 | ||
18 | /* | |
19 | * Include necessary headers... | |
20 | */ | |
21 | ||
a4845881 | 22 | #include <cups/raster-private.h> |
f7deaa1a | 23 | |
24 | ||
25 | /* | |
26 | * Local structures... | |
27 | */ | |
28 | ||
29 | typedef struct _cups_raster_error_s /**** Error buffer structure ****/ | |
30 | { | |
31 | char *start, /* Start of buffer */ | |
32 | *current, /* Current position in buffer */ | |
33 | *end; /* End of buffer */ | |
34 | } _cups_raster_error_t; | |
35 | ||
36 | ||
37 | /* | |
38 | * Local functions... | |
39 | */ | |
40 | ||
41 | static _cups_raster_error_t *get_error_buffer(void); | |
42 | ||
43 | ||
44 | /* | |
45 | * '_cupsRasterAddError()' - Add an error message to the error buffer. | |
46 | */ | |
47 | ||
48 | void | |
49 | _cupsRasterAddError(const char *f, /* I - Printf-style error message */ | |
50 | ...) /* I - Additional arguments as needed */ | |
51 | { | |
52 | _cups_raster_error_t *buf = get_error_buffer(); | |
53 | /* Error buffer */ | |
54 | va_list ap; /* Pointer to additional arguments */ | |
55 | char s[2048]; /* Message string */ | |
7e86f2f6 | 56 | ssize_t bytes; /* Bytes in message string */ |
f7deaa1a | 57 | |
58 | ||
59 | va_start(ap, f); | |
60 | bytes = vsnprintf(s, sizeof(s), f, ap); | |
61 | va_end(ap); | |
62 | ||
63 | if (bytes <= 0) | |
64 | return; | |
65 | ||
66 | bytes ++; | |
67 | ||
7e86f2f6 | 68 | if ((size_t)bytes >= sizeof(s)) |
f7deaa1a | 69 | return; |
70 | ||
7e86f2f6 | 71 | if (bytes > (ssize_t)(buf->end - buf->current)) |
f7deaa1a | 72 | { |
73 | /* | |
74 | * Allocate more memory... | |
75 | */ | |
76 | ||
77 | char *temp; /* New buffer */ | |
78 | size_t size; /* Size of buffer */ | |
79 | ||
80 | ||
7e86f2f6 | 81 | size = (size_t)(buf->end - buf->start + 2 * bytes + 1024); |
f7deaa1a | 82 | |
83 | if (buf->start) | |
84 | temp = realloc(buf->start, size); | |
85 | else | |
86 | temp = malloc(size); | |
87 | ||
88 | if (!temp) | |
89 | return; | |
90 | ||
91 | /* | |
92 | * Update pointers... | |
93 | */ | |
94 | ||
95 | buf->end = temp + size; | |
96 | buf->current = temp + (buf->current - buf->start); | |
97 | buf->start = temp; | |
98 | } | |
99 | ||
100 | /* | |
101 | * Append the message to the end of the current string... | |
102 | */ | |
103 | ||
7e86f2f6 | 104 | memcpy(buf->current, s, (size_t)bytes); |
f7deaa1a | 105 | buf->current += bytes - 1; |
106 | } | |
107 | ||
108 | ||
109 | /* | |
110 | * '_cupsRasterClearError()' - Clear the error buffer. | |
111 | */ | |
112 | ||
113 | void | |
114 | _cupsRasterClearError(void) | |
115 | { | |
116 | _cups_raster_error_t *buf = get_error_buffer(); | |
117 | /* Error buffer */ | |
118 | ||
119 | ||
120 | buf->current = buf->start; | |
121 | ||
122 | if (buf->start) | |
123 | *(buf->start) = '\0'; | |
124 | } | |
125 | ||
126 | ||
127 | /* | |
128 | * 'cupsRasterErrorString()' - Return the last error from a raster function. | |
129 | * | |
130 | * If there are no recent errors, NULL is returned. | |
131 | * | |
f3c17241 | 132 | * @since CUPS 1.3/OS X 10.5@ |
f7deaa1a | 133 | */ |
134 | ||
135 | const char * /* O - Last error */ | |
136 | cupsRasterErrorString(void) | |
137 | { | |
138 | _cups_raster_error_t *buf = get_error_buffer(); | |
139 | /* Error buffer */ | |
140 | ||
141 | ||
142 | if (buf->current == buf->start) | |
143 | return (NULL); | |
144 | else | |
145 | return (buf->start); | |
146 | } | |
147 | ||
148 | ||
149 | #ifdef HAVE_PTHREAD_H | |
150 | /* | |
151 | * Implement per-thread globals... | |
152 | */ | |
153 | ||
154 | # include <pthread.h> | |
155 | ||
156 | ||
157 | /* | |
158 | * Local globals... | |
159 | */ | |
160 | ||
7e86f2f6 | 161 | static pthread_key_t raster_key = 0; /* Thread local storage key */ |
f7deaa1a | 162 | static pthread_once_t raster_key_once = PTHREAD_ONCE_INIT; |
163 | /* One-time initialization object */ | |
164 | ||
165 | ||
166 | /* | |
167 | * Local functions... | |
168 | */ | |
169 | ||
170 | static void raster_init(void); | |
171 | static void raster_destructor(void *value); | |
172 | ||
173 | ||
174 | /* | |
175 | * 'get_error_buffer()' - Return a pointer to thread local storage. | |
176 | */ | |
177 | ||
178 | _cups_raster_error_t * /* O - Pointer to error buffer */ | |
179 | get_error_buffer(void) | |
180 | { | |
181 | _cups_raster_error_t *buf; /* Pointer to error buffer */ | |
182 | ||
183 | ||
321d8d57 | 184 | /* |
f7deaa1a | 185 | * Initialize the global data exactly once... |
186 | */ | |
187 | ||
d9564ec7 | 188 | DEBUG_puts("3get_error_buffer()"); |
f7deaa1a | 189 | |
190 | pthread_once(&raster_key_once, raster_init); | |
191 | ||
192 | /* | |
193 | * See if we have allocated the data yet... | |
194 | */ | |
195 | ||
196 | if ((buf = (_cups_raster_error_t *)pthread_getspecific(raster_key)) | |
197 | == NULL) | |
198 | { | |
d9564ec7 | 199 | DEBUG_puts("4get_error_buffer: allocating memory for thread."); |
f7deaa1a | 200 | |
201 | /* | |
202 | * No, allocate memory as set the pointer for the key... | |
203 | */ | |
204 | ||
205 | buf = calloc(1, sizeof(_cups_raster_error_t)); | |
206 | pthread_setspecific(raster_key, buf); | |
207 | ||
d9564ec7 | 208 | DEBUG_printf(("4get_error_buffer: buf=%p", buf)); |
f7deaa1a | 209 | } |
210 | ||
211 | /* | |
212 | * Return the pointer to the data... | |
213 | */ | |
214 | ||
215 | return (buf); | |
216 | } | |
217 | ||
218 | ||
219 | /* | |
220 | * 'raster_init()' - Initialize error buffer once. | |
221 | */ | |
222 | ||
223 | static void | |
224 | raster_init(void) | |
225 | { | |
226 | pthread_key_create(&raster_key, raster_destructor); | |
227 | ||
d9564ec7 | 228 | DEBUG_printf(("3raster_init(): raster_key=%x(%u)", (unsigned)raster_key, (unsigned)raster_key)); |
f7deaa1a | 229 | } |
230 | ||
231 | ||
232 | /* | |
233 | * 'raster_destructor()' - Free memory allocated by get_error_buffer(). | |
234 | */ | |
235 | ||
236 | static void | |
237 | raster_destructor(void *value) /* I - Data to free */ | |
238 | { | |
239 | _cups_raster_error_t *buf = (_cups_raster_error_t *)value; | |
240 | /* Error buffer */ | |
241 | ||
242 | ||
d9564ec7 | 243 | DEBUG_printf(("3raster_destructor(value=%p)", value)); |
f7deaa1a | 244 | |
245 | if (buf->start) | |
246 | free(buf->start); | |
247 | ||
248 | free(value); | |
249 | } | |
250 | ||
251 | ||
252 | #else | |
253 | /* | |
254 | * Implement static globals... | |
255 | */ | |
256 | ||
257 | /* | |
258 | * 'get_error_buffer()' - Return a pointer to thread local storage. | |
259 | */ | |
260 | ||
261 | _cups_raster_error_t * /* O - Pointer to error buffer */ | |
262 | get_error_buffer(void) | |
263 | { | |
264 | static _cups_raster_error_t buf = { 0, 0, 0 }; | |
265 | /* Error buffer */ | |
266 | ||
267 | ||
268 | return (&buf); | |
269 | } | |
270 | #endif /* HAVE_PTHREAD_H */ | |
271 | ||
272 | ||
273 | /* | |
f2d18633 | 274 | * End of "$Id$". |
f7deaa1a | 275 | */ |