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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/getdelim.c
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initial import
Diffstat (limited to 'stdio/getdelim.c')
-rw-r--r--stdio/getdelim.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/stdio/getdelim.c b/stdio/getdelim.c
new file mode 100644
index 0000000..8047c1f
--- /dev/null
+++ b/stdio/getdelim.c
@@ -0,0 +1,173 @@
+/* Copyright (C) 1991, 1992, 1995 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+/* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR
+ (and null-terminate it). *LINEPTR is a pointer returned from malloc (or
+ NULL), pointing to *N characters of space. It is realloc'd as
+ necessary. Returns the number of characters read (not including the
+ null terminator), or -1 on error or EOF. */
+
+ssize_t
+DEFUN(__getdelim, (lineptr, n, terminator, stream),
+ char **lineptr AND size_t *n AND int terminator AND FILE *stream)
+{
+ char *line, *p;
+ size_t size, copy;
+
+ if (!__validfp (stream) || lineptr == NULL || n == NULL)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (ferror (stream))
+ return -1;
+
+ /* Make sure we have a line buffer to start with. */
+ if (*lineptr == NULL || *n < 2) /* !seen and no buf yet need 2 chars. */
+ {
+#ifndef MAX_CANON
+#define MAX_CANON 256
+#endif
+ line = realloc (*lineptr, MAX_CANON);
+ if (line == NULL)
+ return -1;
+ *lineptr = line;
+ *n = MAX_CANON;
+ }
+
+ line = *lineptr;
+ size = *n;
+
+ copy = size;
+ p = line;
+
+ if (stream->__buffer == NULL && stream->__userbuf)
+ {
+ /* Unbuffered stream. Not much optimization to do. */
+
+ while (1)
+ {
+ size_t len;
+
+ while (--copy > 0)
+ {
+ register int c = getc (stream);
+ if (c == EOF)
+ goto lose;
+ else if ((*p++ = c) == terminator)
+ goto win;
+ }
+
+ /* Need to enlarge the line buffer. */
+ len = p - line;
+ size *= 2;
+ line = realloc (line, size);
+ if (line == NULL)
+ goto lose;
+ *lineptr = line;
+ *n = size;
+ p = line + len;
+ copy = size - len;
+ }
+ }
+ else
+ {
+ /* Leave space for the terminating null. */
+ --copy;
+
+ if (!stream->__seen || stream->__buffer == NULL || stream->__pushed_back)
+ {
+ /* Do one with getc to allocate a buffer. */
+ int c = getc (stream);
+ if (c == EOF)
+ goto lose;
+ *p++ = c;
+ if (c == terminator)
+ goto win;
+ --copy;
+ }
+
+ while (1)
+ {
+ size_t i;
+ char *found;
+
+ i = stream->__get_limit - stream->__bufp;
+ if (i == 0)
+ {
+ /* Refill the buffer. */
+ int c = __fillbf (stream);
+ if (c == EOF)
+ goto lose;
+ *p++ = c;
+ if (c == terminator)
+ goto win;
+ --copy;
+ i = stream->__get_limit - stream->__bufp;
+ }
+
+ if (i > copy)
+ i = copy;
+
+ found = (char *) __memccpy ((PTR) p, stream->__bufp, terminator, i);
+ if (found != NULL)
+ {
+ stream->__bufp += found - p;
+ p = found;
+ goto win;
+ }
+
+ stream->__bufp += i;
+ p += i;
+ copy -= i;
+ if (copy == 0)
+ {
+ /* Need to enlarge the line buffer. */
+ size_t len = p - line;
+ size *= 2;
+ line = realloc (line, size);
+ if (line == NULL)
+ goto lose;
+ *lineptr = line;
+ *n = size;
+ p = line + len;
+ copy = size - len;
+ /* Leave space for the terminating null. */
+ --copy;
+ }
+ }
+ }
+
+ lose:
+ if (p == *lineptr)
+ return -1;
+ /* Return a partial line since we got an error in the middle. */
+ win:
+ *p = '\0';
+ return p - *lineptr;
+}
+
+weak_alias (__getdelim, getdelim)