used in cases where no proper argument vector is passed to env
an example are shebangs:
"#!/usr/bin/env -S executable -o"
this will pass 3 arguments to env: the env executable,
"-S executable -o" as one string and filename.
"-S executable -o" willobe split and "executable -o" will be separate
arguments in the argument vector
---
coreutils/env.c | 39 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)
diff --git a/coreutils/env.c b/coreutils/env.c
index 9ca1fad2d..22cc916be 100644
--- a/coreutils/env.c
+++ b/coreutils/env.c
@@ -48,6 +48,7 @@
//usage: "\n -, -i Start with empty environment"
//usage: "\n -0 NUL terminated output"
//usage: "\n -u NAME Remove variable from environment"
+//usage: "\n -S ARGS split into separate arguments, only useful in
shebang or similar"
#include "libbb.h"
#include <getopt.h>
@@ -56,10 +57,11 @@ static struct option const long_options[] = {
{"ignore-environment", no_argument, 0, 'i' },
{"null", no_argument, 0, '0' },
{"unset", required_argument, 0, 'u' },
+ {"split", required_argument, 0, 'S' },
{0, 0, 0, 0 }
};
-static char const short_options[] = "+iu:0";
+static char const short_options[] = "+iS:u:0";
static char const **unset_vars;
static int num_unset_vars;
@@ -70,6 +72,38 @@ static void add_unset_var (char const *var)
unset_vars[num_unset_vars++] = var;
}
+// inspired by GNU core utilities env.c
+static void split_string (char const *str, int *optind, int *argc, char
***argv)
+{
+ // remember the amount of extra arguments after the string to split
+ int extra_argc = *argc - *optind;
+ // 1 is reserved for the executable name of env
+ int new_argc = extra_argc + 1;
+ int new_ind = new_argc - extra_argc;
+ char **new_argv = NULL;
+ char *arg, *tokstate;
+
+ // keep it simple, assume arguments are split by spaces
+ arg = strtok_r (str, " ", &tokstate);
+ while (arg != NULL) {
+ // increase size of new_argv
+ new_argv = xrealloc(new_argv, ++new_argc * sizeof(char *));
+ // copy the current argument to new_argv
+ new_argv[new_ind++] = xstrdup(arg);
+ arg = strtok_r (NULL, " ", &tokstate);
+ }
+ // keep executable name
+ *new_argv = (*argv)[0];
+
+ // copy remaining arguments
+ memcpy(new_argv + new_ind, *argv + *optind, (extra_argc + 1) *
sizeof(char *));
+
+ // write back values to argc and argv
+ *argc = new_argc;
+ *argv = new_argv;
+ *optind = 0;
+}
+
int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int env_main(int argc, char **argv)
{
@@ -90,6 +124,9 @@ int env_main(int argc, char **argv)
case '0':
null_terminate_output = true;
break;
+ case 'S':
+ split_string(optarg, &optind, &argc, &argv);
+ break;
default:
exit(EXIT_FAILURE);
}
--
2.30.2
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