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[RFA] Add libiberty/argv.c:countargv
- From: dje at google dot com (Doug Evans)
- To: gcc-patches at gcc dot gnu dot org
- Date: Tue, 20 Sep 2011 11:23:34 -0700 (PDT)
- Subject: [RFA] Add libiberty/argv.c:countargv
Hi.
Part of the abstraction of an argv is a count of the number elements.
This patch adds countargv which I have use for in gdb.
Ok to check in?
2011-09-20 Doug Evans <dje@google.com>
include/
* libiberty.h (countargv): Declare.
libiberty/
* argv.c (countargv): New function.
Index: include/libiberty.h
===================================================================
RCS file: /cvs/src/src/include/libiberty.h,v
retrieving revision 1.64
diff -u -p -r1.64 libiberty.h
--- include/libiberty.h 22 Jul 2011 14:37:51 -0000 1.64
+++ include/libiberty.h 20 Sep 2011 18:18:07 -0000
@@ -91,6 +91,10 @@ extern void expandargv PARAMS ((int *, c
extern int writeargv PARAMS ((char **, FILE *));
+/* Return the number of elements in argv. */
+
+extern int countargv (char**);
+
/* Return the last component of a path name. Note that we can't use a
prototype here because the parameter is declared inconsistently
across different systems, sometimes as "char *" and sometimes as
Index: libiberty/argv.c
===================================================================
RCS file: /cvs/src/src/libiberty/argv.c,v
retrieving revision 1.22
diff -u -p -r1.22 argv.c
--- libiberty/argv.c 13 Aug 2010 11:36:10 -0000 1.22
+++ libiberty/argv.c 20 Sep 2011 18:21:28 -0000
@@ -492,6 +492,28 @@ expandargv (int *argcp, char ***argvp)
}
}
+/*
+
+@deftypefn Extension int countargv (char **@var{argv})
+
+Return the number of elements in @var{argv}.
+Returns zero if @var{argv} is NULL.
+
+@end deftypefn
+
+*/
+
+int
+countargv (char **argv)
+{
+ int argc;
+
+ if (argv == NULL)
+ return 0;
+ for (argc = 0; argv[argc] != NULL; argc++);
+ return argc;
+}
+
#ifdef MAIN
/* Simple little test driver. */