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code.delx.au - pulseaudio/blob - src/pulsecore/strbuf.c
4 This file is part of PulseAudio.
6 Copyright 2004-2006 Lennart Poettering
8 PulseAudio is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published
10 by the Free Software Foundation; either version 2 of the License,
11 or (at your option) any later version.
13 PulseAudio is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with PulseAudio; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
28 #include <sys/types.h>
34 #include <pulse/xmalloc.h>
35 #include <pulsecore/macro.h>
39 /* A chunk of the linked list that makes up the string */
45 #define CHUNK_TO_TEXT(c) ((char*) (c) + PA_ALIGN(sizeof(struct chunk)))
49 struct chunk
*head
, *tail
;
52 pa_strbuf
*pa_strbuf_new(void) {
55 sb
= pa_xnew(pa_strbuf
, 1);
57 sb
->head
= sb
->tail
= NULL
;
62 void pa_strbuf_free(pa_strbuf
*sb
) {
66 struct chunk
*c
= sb
->head
;
67 sb
->head
= sb
->head
->next
;
74 /* Make a C string from the string buffer. The caller has to free
75 * string with pa_xfree(). */
76 char *pa_strbuf_tostring(pa_strbuf
*sb
) {
82 e
= t
= pa_xnew(char, sb
->length
+1);
84 for (c
= sb
->head
; c
; c
= c
->next
) {
85 pa_assert((size_t) (e
-t
) <= sb
->length
);
86 memcpy(e
, CHUNK_TO_TEXT(c
), c
->length
);
93 pa_assert(e
== t
+sb
->length
);
98 /* Combination of pa_strbuf_free() and pa_strbuf_tostring() */
99 char *pa_strbuf_tostring_free(pa_strbuf
*sb
) {
103 t
= pa_strbuf_tostring(sb
);
109 /* Append a string to the string buffer */
110 void pa_strbuf_puts(pa_strbuf
*sb
, const char *t
) {
115 pa_strbuf_putsn(sb
, t
, strlen(t
));
118 /* Append a new chunk to the linked list */
119 static void append(pa_strbuf
*sb
, struct chunk
*c
) {
127 pa_assert(!sb
->head
);
132 sb
->length
+= c
->length
;
136 /* Append up to l bytes of a string to the string buffer */
137 void pa_strbuf_putsn(pa_strbuf
*sb
, const char *t
, size_t l
) {
146 c
= pa_xmalloc(PA_ALIGN(sizeof(struct chunk
)) + l
);
148 memcpy(CHUNK_TO_TEXT(c
), t
, l
);
153 /* Append a printf() style formatted string to the string buffer. */
154 /* The following is based on an example from the GNU libc documentation */
155 int pa_strbuf_printf(pa_strbuf
*sb
, const char *format
, ...) {
157 struct chunk
*c
= NULL
;
166 c
= pa_xrealloc(c
, PA_ALIGN(sizeof(struct chunk
)) + size
);
168 va_start(ap
, format
);
169 r
= vsnprintf(CHUNK_TO_TEXT(c
), size
, format
, ap
);
170 CHUNK_TO_TEXT(c
)[size
-1] = 0;
173 if (r
> -1 && r
< size
) {
179 if (r
> -1) /* glibc 2.1 */