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readlink: do not emit errors if file doesnt not exist / not a link

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getopt32: add =N support
This commit is contained in:
Denis Vlasenko 2006-10-20 18:36:55 +00:00
parent df51892690
commit 456fa6c0b1
2 changed files with 31 additions and 11 deletions
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33
debianutils/readlink.c
View File

@ -13,21 +13,32 @@
#include <stdlib.h>
#include <getopt.h>
#define READLINK_FLAG_f (1 << 0)
int readlink_main(int argc, char **argv)
{
char *buf;
unsigned opt = ENABLE_FEATURE_READLINK_FOLLOW ?
getopt32(argc, argv, "f") : 0;
char *fname;
if (argc != (ENABLE_FEATURE_READLINK_FOLLOW ? optind + 1 : 2))
bb_show_usage();
USE_FEATURE_READLINK_FOLLOW(
unsigned opt;
/* We need exactly one non-option argument. */
opt_complementary = "=1";
opt = getopt32(argc, argv, "f");
fname = argv[optind];
)
SKIP_FEATURE_READLINK_FOLLOW(
const unsigned opt = 0;
if (argc != 2) bb_show_usage();
fname = argv[1];
)
if (opt & READLINK_FLAG_f)
buf = realpath(argv[optind], bb_common_bufsiz1);
else
buf = xreadlink(argv[ENABLE_FEATURE_READLINK_FOLLOW ? optind : 1]);
/* compat: coreutils readlink reports errors silently via exit code */
logmode = LOGMODE_NONE;
if (opt) {
buf = realpath(fname, bb_common_bufsiz1);
} else {
buf = xreadlink(fname);
}
if (!buf)
return EXIT_FAILURE;
@ -36,5 +47,5 @@ int readlink_main(int argc, char **argv)
if (ENABLE_FEATURE_CLEAN_UP && buf != bb_common_bufsiz1)
free(buf);
return EXIT_SUCCESS;
bb_fflush_stdout_and_exit(EXIT_SUCCESS);
}

9
libbb/getopt32.c
View File

@ -188,6 +188,10 @@ Special characters:
by a single digit (0-9) means that at least N non-option
arguments must be present on the command line
"=N" An equal sign as the first char in a opt_complementary group followed
by a single digit (0-9) means that exactly N non-option
arguments must be present on the command line
"V-" An option with dash before colon or end-of-line results in
bb_show_usage being called if this option is encountered.
This is typically used to implement "print verbose usage message
@ -400,6 +404,11 @@ getopt32(int argc, char **argv, const char *applet_opts, ...)
}
continue;
}
if (*s == '=') {
min_arg = max_arg = c - '0';
s++;
continue;
}
for (on_off = complementary; on_off->opt; on_off++)
if (on_off->opt == *s)
break;