From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- stdio/vasprintf.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 stdio/vasprintf.c (limited to 'stdio/vasprintf.c') 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 +#include +#include +#include +#include +#include + + + +/* 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; +} -- cgit v1.2.3