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Support the environtmental var "GREP_OPTIONS". Which can hold a set of

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default options for diff.  These options are interpreted first and can be
overwritten by explicit command line parameters.

Obtained from:	GNU Grep 2.3h
This commit is contained in:
David E. O'Brien 1999-11-26 03:26:59 +00:00
parent c0bc11462b
commit 07bdb1554d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=53705
2 changed files with 69 additions and 0 deletions
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8
gnu/usr.bin/grep/grep.1
View File

@ -462,6 +462,14 @@ the metacharacter
.B {
loses its special meaning; instead use
.BR \e{ .
.SH ENVIRONMENT
The environment variable
.B GREP_OPTIONS
can hold a set of default
options for
.I grep.
These options are interpreted first and can be overwritten by explicit command
line parameters.
.SH DIAGNOSTICS
.PP
Normally, exit status is 0 if matches were found,

61
gnu/usr.bin/grep/grep.c
View File

@ -1045,6 +1045,65 @@ setmatcher (name)
return 0;
}
/* Find the white-space-separated options specified by OPTIONS, and
using BUF to store copies of these options, set ARGV[0], ARGV[1],
etc. to the option copies. Return the number N of options found.
Do not set ARGV[N] to NULL. If ARGV is NULL, do not store ARGV[0]
etc. Backslash can be used to escape whitespace (and backslashes). */
static int
prepend_args (options, buf, argv)
char const *options;
char *buf;
char **argv;
{
char const *o = options;
char *b = buf;
int n = 0;
for (;;)
{
while (ISSPACE ((unsigned char) *o))
o++;
if (!*o)
return n;
if (argv)
argv[n] = b;
n++;
do
if ((*b++ = *o++) == '\\' && *o)
b[-1] = *o++;
while (*o && ! ISSPACE ((unsigned char) *o));
*b++ = '\0';
}
}
/* Prepend the whitespace-separated options in OPTIONS to the argument
vector of a main program with argument count *PARGC and argument
vector *PARGV. */
static void
prepend_default_options (options, pargc, pargv)
char const *options;
int *pargc;
char ***pargv;
{
if (options)
{
char *buf = xmalloc (strlen (options) + 1);
int prepended = prepend_args (options, buf, (char **) NULL);
int argc = *pargc;
char * const *argv = *pargv;
char **pp = (char **) xmalloc ((prepended + argc + 1) * sizeof *pp);
*pargc = prepended + argc;
*pargv = pp;
*pp++ = *argv++;
pp += prepend_args (options, buf, pp);
while ((*pp++ = *argv++))
continue;
}
}
int
main (argc, argv)
int argc;
@ -1118,6 +1177,8 @@ main (argc, argv)
textdomain (PACKAGE);
#endif
prepend_default_options (getenv ("GREP_OPTIONS"), &argc, &argv);
while ((opt = getopt_long (argc, argv,
#if O_BINARY
"0123456789A:B:C::EFGHVX:abcd:e:f:hiLlnqrsvwxyUu",