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authorRoland McGrath <roland@gnu.org>1996-04-29 05:21:53 +0000
committerRoland McGrath <roland@gnu.org>1996-04-29 05:21:53 +0000
commit392d7920cd6e66a9e0fd6a4fb2c93d1ccabf65b9 (patch)
tree0071b8b380e466f0f27db67b8f678bfb5f234aa8 /string/argz-insert.c
parent7b3547eb0fb471e1f2135f709eb53d79a45838cb (diff)
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Mon Apr 29 00:11:59 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* errno.h [!__error_t_defined] (error_t): New type. * sysdeps/mach/hurd/errnos.awk: #define __error_t_defined after the typedef in errnos.h. * string/envz.c, string/envz.h: New files. * string/argz.h, string/argz-append.c, string/argz-count.c, string/argz-create.c, string/argz-delete.c, string/argz-extract.c, string/argz-insert.c, string/argz-stringify.c: New files. * string/Makefile (routines): Add envz, argz-*. (headers): Add argz.h, envz.h.
Diffstat (limited to 'string/argz-insert.c')
-rw-r--r--string/argz-insert.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/string/argz-insert.c b/string/argz-insert.c
new file mode 100644
index 0000000000..a110060e9d
--- /dev/null
+++ b/string/argz-insert.c
@@ -0,0 +1,64 @@
+/* Routines for dealing with '\0' separated arg vectors.
+
+ Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+
+ Written by Miles Bader <miles@gnu.ai.mit.edu>
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <argz.h>
+#include <string.h>
+#include <stdlib.h>
+
+/* Insert ENTRY into ARGZ & ARGZ_LEN before BEFORE, which should be an
+ existing entry in ARGZ; if BEFORE is NULL, ENTRY is appended to the end.
+ Since ARGZ's first entry is the same as ARGZ, argz_insert (ARGZ, ARGZ_LEN,
+ ARGZ, ENTRY) will insert ENTRY at the beginning of ARGZ. If BEFORE is not
+ in ARGZ, EINVAL is returned, else if memory can't be allocated for the new
+ ARGZ, ENOMEM is returned, else 0. */
+error_t
+__argz_insert (char **argz, size_t *argz_len, char *before, const char *entry)
+{
+ if (! before)
+ return __argz_add (argz, argz_len, entry);
+
+ if (before < *argz || before >= *argz + *argz_len)
+ return EINVAL;
+
+ if (before > *argz)
+ /* Make sure before is actually the beginning of an entry. */
+ while (before[-1])
+ before--;
+
+ {
+ size_t after_before = *argz_len - (before - *argz);
+ size_t entry_len = strlen (entry) + 1;
+ size_t new_argz_len = *argz_len + entry_len;
+ char *new_argz = realloc (*argz, new_argz_len);
+
+ if (new_argz)
+ {
+ before = new_argz + (before - *argz);
+ memcpy (before + entry_len, before, after_before);
+ memcpy (before, entry, entry_len);
+ *argz = new_argz;
+ *argz_len = new_argz_len;
+ return 0;
+ }
+ else
+ return ENOMEM;
+ }
+}
+weak_alias (__argz_insert, argz_insert)