| /* Copyright (C) 1991, 1992, 1997 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., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include <stddef.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| |
| |
| /* Enlarge STREAM's buffer. */ |
| static void |
| enlarge_buffer (stream, c) |
| FILE *stream; |
| int c; |
| { |
| ptrdiff_t bufp_offset = stream->__bufp - stream->__buffer; |
| char *newbuf; |
| |
| stream->__bufsize += 100; |
| newbuf = (char *) realloc ((void *) stream->__buffer, stream->__bufsize); |
| if (newbuf == NULL) |
| { |
| free ((void *) 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 |
| vasprintf (char **string_ptr, |
| const char *format, |
| va_list args) |
| { |
| FILE f; |
| int done; |
| |
| memset ((void *) &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; |
| } |