Extracted from getstr.c.

1 files changed, 110 insertions, 0 deletions

diff --git a/lib/getdelim2.c b/lib/getdelim2.c
new file mode 100644
index 000000000..96e2f78f3
--- /dev/null
+++ b/lib/getdelim2.c
@@ -0,0 +1,110 @@
+/* getdelim2.c -- a variant of getdelim
+
+   Copyright (C) 2003 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Written by Jan Brittenson, bson@gnu.ai.mit.edu.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "getdelim2.h"
+
+#include <stdlib.h>
+
+#include "unlocked-io.h"
+
+/* Always add at least this many bytes when extending the buffer.  */
+#define MIN_CHUNK 64
+
+/* Read up to (and including) a delimiter DELIM1 from STREAM into *LINEPTR
+   + OFFSET (and NUL-terminate it).  If DELIM2 is non-zero, then read up
+   and including the first occurrence of DELIM1 or DELIM2.  *LINEPTR is
+   a pointer returned from malloc (or NULL), pointing to *N characters of
+   space.  It is realloc'd as necessary.  Return the number of characters
+   read (not including the NUL terminator), or -1 on error or EOF.  */
+
+int
+getdelim2 (char **lineptr, size_t *n, FILE *stream, int delim1, int delim2,
+	   size_t offset)
+{
+  size_t nchars_avail;		/* Allocated but unused chars in *LINEPTR.  */
+  char *read_pos;		/* Where we're reading into *LINEPTR. */
+  int ret;
+
+  if (!lineptr || !n || !stream)
+    return -1;
+
+  if (!*lineptr)
+    {
+      *n = MIN_CHUNK;
+      *lineptr = malloc (*n);
+      if (!*lineptr)
+	return -1;
+    }
+
+  if (*n < offset)
+    return -1;
+
+  nchars_avail = *n - offset;
+  read_pos = *lineptr + offset;
+
+  for (;;)
+    {
+      register int c = getc (stream);
+
+      /* We always want at least one char left in the buffer, since we
+	 always (unless we get an error while reading the first char)
+	 NUL-terminate the line buffer.  */
+
+      if (nchars_avail < 2)
+	{
+	  if (*n > MIN_CHUNK)
+	    *n *= 2;
+	  else
+	    *n += MIN_CHUNK;
+
+	  nchars_avail = *n + *lineptr - read_pos;
+	  *lineptr = realloc (*lineptr, *n);
+	  if (!*lineptr)
+	    return -1;
+	  read_pos = *n - nchars_avail + *lineptr;
+	}
+
+      if (c == EOF || ferror (stream))
+	{
+	  /* Return partial line, if any.  */
+	  if (read_pos == *lineptr)
+	    return -1;
+	  else
+	    break;
+	}
+
+      *read_pos++ = c;
+      nchars_avail--;
+
+      if (c == delim1 || (delim2 && c == delim2))
+	/* Return the line.  */
+	break;
+    }
+
+  /* Done - NUL terminate and return the number of chars read.  */
+  *read_pos = '\0';
+
+  ret = read_pos - (*lineptr + offset);
+  return ret;
+}