summaryrefslogtreecommitdiff
path: root/ares__read_line.c
diff options
context:
space:
mode:
authorDaniel Stenberg <daniel@haxx.se>2003-10-07 21:54:04 (GMT)
committerDaniel Stenberg <daniel@haxx.se>2003-10-07 21:54:04 (GMT)
commit5e847a14bd65383ce65f143c578e120899981fd9 (patch)
tree0072e647fe22e05aee94cf4e4bf101209e30626c /ares__read_line.c
downloadc-ares-5e847a14bd65383ce65f143c578e120899981fd9.zip
c-ares-5e847a14bd65383ce65f143c578e120899981fd9.tar.gz
c-ares-5e847a14bd65383ce65f143c578e120899981fd9.tar.bz2
ares 1.1.1 with collected applied patches
Diffstat (limited to 'ares__read_line.c')
-rw-r--r--ares__read_line.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/ares__read_line.c b/ares__read_line.c
new file mode 100644
index 0000000..65bfde2
--- /dev/null
+++ b/ares__read_line.c
@@ -0,0 +1,64 @@
+/* Copyright 1998 by the Massachusetts Institute of Technology.
+ *
+ * Permission to use, copy, modify, and distribute this
+ * software and its documentation for any purpose and without
+ * fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ */
+
+static const char rcsid[] = "$Id$";
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "ares.h"
+#include "ares_private.h"
+
+/* This is an internal function. Its contract is to read a line from
+ * a file into a dynamically allocated buffer, zeroing the trailing
+ * newline if there is one. The calling routine may call
+ * ares__read_line multiple times with the same buf and bufsize
+ * pointers; *buf will be reallocated and *bufsize adjusted as
+ * appropriate. The initial value of *buf should be NULL. After the
+ * calling routine is done reading lines, it should free *buf.
+ */
+int ares__read_line(FILE *fp, char **buf, int *bufsize)
+{
+ char *newbuf;
+ int offset = 0, len;
+
+ if (*buf == NULL)
+ {
+ *buf = malloc(128);
+ if (!*buf)
+ return ARES_ENOMEM;
+ *bufsize = 128;
+ }
+
+ while (1)
+ {
+ if (!fgets(*buf + offset, *bufsize - offset, fp))
+ return (offset != 0) ? 0 : (ferror(fp)) ? ARES_EFILE : ARES_EOF;
+ len = offset + strlen(*buf + offset);
+ if ((*buf)[len - 1] == '\n')
+ {
+ (*buf)[len - 1] = 0;
+ return ARES_SUCCESS;
+ }
+ offset = len;
+
+ /* Allocate more space. */
+ newbuf = realloc(*buf, *bufsize * 2);
+ if (!newbuf)
+ return ARES_ENOMEM;
+ *buf = newbuf;
+ *bufsize *= 2;
+ }
+}