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-rw-r--r--source4/lib/json/printbuf.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/source4/lib/json/printbuf.c b/source4/lib/json/printbuf.c
new file mode 100644
index 0000000000..79bdaf554a
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+++ b/source4/lib/json/printbuf.c
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+/*
+ * $Id: printbuf.c,v 1.5 2006/01/26 02:16:28 mclark Exp $
+ *
+ * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
+ * Michael Clark <michael@metaparadigm.com>
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See COPYING for details.
+ *
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if HAVE_STDARG_H
+# include <stdarg.h>
+#else /* !HAVE_STDARG_H */
+# error Not enough var arg support!
+#endif /* HAVE_STDARG_H */
+
+#include "bits.h"
+#include "debug.h"
+#include "printbuf.h"
+
+struct printbuf* printbuf_new()
+{
+ struct printbuf *p;
+
+ if(!(p = calloc(1, sizeof(struct printbuf)))) return NULL;
+ p->size = 32;
+ p->bpos = 0;
+ if(!(p->buf = malloc(p->size))) {
+ free(p);
+ return NULL;
+ }
+ return p;
+}
+
+
+int printbuf_memappend(struct printbuf *p, char *buf, int size)
+{
+ char *t;
+ if(p->size - p->bpos <= size) {
+ int new_size = max(p->size * 2, p->bpos + size + 8);
+#ifdef PRINTBUF_DEBUG
+ mc_debug("printbuf_memappend: realloc "
+ "bpos=%d wrsize=%d old_size=%d new_size=%d\n",
+ p->bpos, size, p->size, new_size);
+#endif /* PRINTBUF_DEBUG */
+ if(!(t = realloc(p->buf, new_size))) return -1;
+ p->size = new_size;
+ p->buf = t;
+ }
+ memcpy(p->buf + p->bpos, buf, size);
+ p->bpos += size;
+ p->buf[p->bpos]= '\0';
+ return size;
+}
+
+#if !HAVE_VSNPRINTF && defined(WIN32)
+# define vsnprintf _vsnprintf
+#elif !HAVE_VSNPRINTF /* !HAVE_VSNPRINTF */
+# error Need vsnprintf!
+#endif /* !HAVE_VSNPRINTF && defined(WIN32) */
+
+#if !HAVE_VASPRINTF
+/* CAW: compliant version of vasprintf */
+static int vasprintf(char **buf, const char *fmt, va_list ap)
+{
+#ifndef WIN32
+ static char _T_emptybuffer = '\0';
+#endif /* !defined(WIN32) */
+ int chars;
+ char *b;
+
+ if(!buf) { return -1; }
+
+#ifdef WIN32
+ chars = _vscprintf(fmt, ap)+1;
+#else /* !defined(WIN32) */
+ /* CAW: RAWR! We have to hope to god here that vsnprintf doesn't overwrite
+ our buffer like on some 64bit sun systems.... but hey, its time to move on */
+ chars = vsnprintf(&_T_emptybuffer, 0, fmt, ap)+1;
+ if(chars < 0) { chars *= -1; } /* CAW: old glibc versions have this problem */
+#endif /* defined(WIN32) */
+
+ b = (char*)malloc(sizeof(char)*chars);
+ if(!b) { return -1; }
+
+ if((chars = vsprintf(b, fmt, ap)) < 0)
+ {
+ free(b);
+ } else {
+ *buf = b;
+ }
+
+ return chars;
+}
+#endif /* !HAVE_VASPRINTF */
+
+int sprintbuf(struct printbuf *p, const char *msg, ...)
+{
+ va_list ap;
+ char *t;
+ int size;
+ char buf[128];
+
+ /* user stack buffer first */
+ va_start(ap, msg);
+ size = vsnprintf(buf, 128, msg, ap);
+ va_end(ap);
+ /* if string is greater than stack buffer, then use dynamic string
+ with vasprintf. Note: some implementation of vsnprintf return -1
+ if output is truncated whereas some return the number of bytes that
+ would have been writen - this code handles both cases. */
+ if(size == -1 || size > 127) {
+ int ret;
+ va_start(ap, msg);
+ if((size = vasprintf(&t, msg, ap)) == -1) return -1;
+ va_end(ap);
+ ret = printbuf_memappend(p, t, size);
+ free(t);
+ return ret;
+ } else {
+ return printbuf_memappend(p, buf, size);
+ }
+}
+
+void printbuf_reset(struct printbuf *p)
+{
+ p->buf[0] = '\0';
+ p->bpos = 0;
+}
+
+void printbuf_free(struct printbuf *p)
+{
+ if(p) {
+ free(p->buf);
+ free(p);
+ }
+}