summaryrefslogtreecommitdiffstats
path: root/src/pulsecore/strbuf.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/pulsecore/strbuf.c')
-rw-r--r--src/pulsecore/strbuf.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/src/pulsecore/strbuf.c b/src/pulsecore/strbuf.c
new file mode 100644
index 00000000..ef8160dc
--- /dev/null
+++ b/src/pulsecore/strbuf.c
@@ -0,0 +1,167 @@
+/* $Id$ */
+
+/***
+ This file is part of PulseAudio.
+
+ PulseAudio is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2 of the License,
+ or (at your option) any later version.
+
+ PulseAudio is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with PulseAudio; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <pulse/xmalloc.h>
+
+#include "strbuf.h"
+
+/* A chunk of the linked list that makes up the string */
+struct chunk {
+ struct chunk *next;
+ size_t length;
+};
+
+#define CHUNK_TO_TEXT(c) ((char*) (c) + sizeof(struct chunk))
+
+struct pa_strbuf {
+ size_t length;
+ struct chunk *head, *tail;
+};
+
+pa_strbuf *pa_strbuf_new(void) {
+ pa_strbuf *sb = pa_xmalloc(sizeof(pa_strbuf));
+ sb->length = 0;
+ sb->head = sb->tail = NULL;
+ return sb;
+}
+
+void pa_strbuf_free(pa_strbuf *sb) {
+ assert(sb);
+ while (sb->head) {
+ struct chunk *c = sb->head;
+ sb->head = sb->head->next;
+ pa_xfree(c);
+ }
+
+ pa_xfree(sb);
+}
+
+/* Make a C string from the string buffer. The caller has to free
+ * string with pa_xfree(). */
+char *pa_strbuf_tostring(pa_strbuf *sb) {
+ char *t, *e;
+ struct chunk *c;
+ assert(sb);
+
+ e = t = pa_xmalloc(sb->length+1);
+
+ for (c = sb->head; c; c = c->next) {
+ assert((size_t) (e-t) <= sb->length);
+ memcpy(e, CHUNK_TO_TEXT(c), c->length);
+ e += c->length;
+ }
+
+ /* Trailing NUL */
+ *e = 0;
+
+ assert(e == t+sb->length);
+
+ return t;
+}
+
+/* Combination of pa_strbuf_free() and pa_strbuf_tostring() */
+char *pa_strbuf_tostring_free(pa_strbuf *sb) {
+ char *t;
+ assert(sb);
+ t = pa_strbuf_tostring(sb);
+ pa_strbuf_free(sb);
+ return t;
+}
+
+/* Append a string to the string buffer */
+void pa_strbuf_puts(pa_strbuf *sb, const char *t) {
+ assert(sb && t);
+ pa_strbuf_putsn(sb, t, strlen(t));
+}
+
+/* Append a new chunk to the linked list */
+static void append(pa_strbuf *sb, struct chunk *c) {
+ assert(sb && c);
+
+ if (sb->tail) {
+ assert(sb->head);
+ sb->tail->next = c;
+ } else {
+ assert(!sb->head);
+ sb->head = c;
+ }
+
+ sb->tail = c;
+ sb->length += c->length;
+ c->next = NULL;
+}
+
+/* Append up to l bytes of a string to the string buffer */
+void pa_strbuf_putsn(pa_strbuf *sb, const char *t, size_t l) {
+ struct chunk *c;
+ assert(sb && t);
+
+ if (!l)
+ return;
+
+ c = pa_xmalloc(sizeof(struct chunk)+l);
+ c->length = l;
+ memcpy(CHUNK_TO_TEXT(c), t, l);
+
+ append(sb, c);
+}
+
+/* Append a printf() style formatted string to the string buffer. */
+/* The following is based on an example from the GNU libc documentation */
+int pa_strbuf_printf(pa_strbuf *sb, const char *format, ...) {
+ int size = 100;
+ struct chunk *c = NULL;
+
+ assert(sb);
+
+ for(;;) {
+ va_list ap;
+ int r;
+
+ c = pa_xrealloc(c, sizeof(struct chunk)+size);
+
+ va_start(ap, format);
+ r = vsnprintf(CHUNK_TO_TEXT(c), size, format, ap);
+ va_end(ap);
+
+ if (r > -1 && r < size) {
+ c->length = r;
+ append(sb, c);
+ return r;
+ }
+
+ if (r > -1) /* glibc 2.1 */
+ size = r+1;
+ else /* glibc 2.0 */
+ size *= 2;
+ }
+}