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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /stdio/vasprintf.c
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initial import
Diffstat (limited to 'stdio/vasprintf.c')
-rw-r--r--stdio/vasprintf.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/stdio/vasprintf.c b/stdio/vasprintf.c
new file mode 100644
index 0000000000..d2ad6b1da6
--- /dev/null
+++ b/stdio/vasprintf.c
@@ -0,0 +1,86 @@
+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+/* Enlarge STREAM's buffer. */
+static void
+DEFUN(enlarge_buffer, (stream, c),
+ register FILE *stream AND int c)
+{
+ ptrdiff_t bufp_offset = stream->__bufp - stream->__buffer;
+ char *newbuf;
+
+ stream->__bufsize += 100;
+ newbuf = (char *) realloc ((PTR) stream->__buffer, stream->__bufsize);
+ if (newbuf == NULL)
+ {
+ free ((PTR) stream->__buffer);
+ stream->__buffer = stream->__bufp
+ = stream->__put_limit = stream->__get_limit = NULL;
+ stream->__error = 1;
+ }
+ else
+ {
+ stream->__buffer = newbuf;
+ stream->__bufp = stream->__buffer + bufp_offset;
+ stream->__get_limit = stream->__put_limit;
+ stream->__put_limit = stream->__buffer + stream->__bufsize;
+ if (c != EOF)
+ *stream->__bufp++ = (unsigned char) c;
+ }
+}
+
+/* Write formatted output from FORMAT to a string which is
+ allocated with malloc and stored in *STRING_PTR. */
+int
+DEFUN(vasprintf, (string_ptr, format, args),
+ char **string_ptr AND CONST char *format AND va_list args)
+{
+ FILE f;
+ int done;
+
+ memset ((PTR) &f, 0, sizeof (f));
+ f.__magic = _IOMAGIC;
+ f.__bufsize = 100;
+ f.__buffer = (char *) malloc (f.__bufsize);
+ if (f.__buffer == NULL)
+ return -1;
+ f.__bufp = f.__buffer;
+ f.__put_limit = f.__buffer + f.__bufsize;
+ f.__mode.__write = 1;
+ f.__room_funcs.__output = enlarge_buffer;
+ f.__seen = 1;
+
+ done = vfprintf (&f, format, args);
+ if (done < 0)
+ return done;
+
+ *string_ptr = realloc (f.__buffer, (f.__bufp - f.__buffer) + 1);
+ if (*string_ptr == NULL)
+ *string_ptr = f.__buffer;
+ (*string_ptr)[f.__bufp - f.__buffer] = '\0';
+ return done;
+}