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.

1 files changed, 100 insertions, 0 deletions

diff --git a/string/argz.h b/string/argz.h
new file mode 100644
index 0000000000..9c03815915
--- /dev/null
+++ b/string/argz.h
@@ -0,0 +1,100 @@
+/* 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. */
+
+#ifndef __ARGZ_H__
+#define __ARGZ_H__	1
+#include <errno.h>		/* Define error_t.  */
+#include <string.h>		/* Need size_t, and strchr is called below.  */
+
+/* Make a '\0' separated arg vector from a unix argv vector, returning it in
+   ARGZ, and the total length in LEN.  If a memory allocation error occurs,
+   ENOMEM is returned, otherwise 0.  The result can be destroyed using free. */
+error_t __argz_create (char **argv, char **argz, size_t *len);
+error_t argz_create (char **argv, char **argz, size_t *len);
+
+/* Returns the number of strings in ARGZ.  */
+size_t __argz_count (const char *argz, size_t len);
+size_t argz_count (const char *argz, size_t len);
+
+/* Puts pointers to each string in ARGZ into ARGV, which must be large enough
+   to hold them all.  */
+void __argz_extract (const char *argz, size_t len, char **argv);
+void argz_extract (const char *argz, size_t len, char **argv);
+
+/* Make '\0' separated arg vector ARGZ printable by converting all the '\0's
+   except the last into the character SEP.  */
+void __argz_stringify (char *argz, size_t len, int sep);
+void argz_stringify (char *argz, size_t len, int sep);
+
+/* Append BUF, of length BUF_LEN to the argz vector in ARGZ & ARGZ_LEN.  */
+error_t __argz_append (char **argz, size_t *argz_len,
+		       const char *buf, size_t buf_len);
+error_t argz_append (char **argz, size_t *argz_len,
+		     const char *buf, size_t buf_len);
+
+/* Append STR to the argz vector in ARGZ & ARGZ_LEN.  */
+error_t __argz_add (char **argz, size_t *argz_len, const char *str);
+error_t argz_add (char **argz, size_t *argz_len, const char *str);
+
+/* Delete ENTRY from ARGZ & ARGZ_LEN, if it appears there.  */
+void __argz_delete (char **argz, size_t *argz_len, char *entry);
+void argz_delete (char **argz, size_t *argz_len, char *entry);
+
+/* 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);
+error_t argz_insert (char **argz, size_t *argz_len,
+		     char *before, const char *entry);
+
+/* Returns the next entry in ARGZ & ARGZ_LEN after ENTRY, or NULL if there
+   are no more.  If entry is NULL, then the first entry is returned.  This
+   behavior allows two convenient iteration styles:
+
+    char *entry = 0;
+    while (entry = argz_next (argz, argz_len, entry))
+      ...;
+
+   or
+
+    char *entry;
+    for (entry = argz; entry; entry = argz_next (argz, argz_len, entry))
+      ...;
+*/
+extern inline char *
+argz_next (char *argz, size_t argz_len, const char *entry)
+{
+  if (entry)
+    if (entry >= argz + argz_len)
+      return 0;
+    else
+      return strchr (entry, '\0') + 1;
+  else
+    if (argz_len > 0)
+      return argz;
+    else
+      return 0;
+}
+
+#endif /* __ARGZ_H__ */