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returns exit status 1 on failure and allows multiple matches

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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1459 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Daniel Reinhold 2002-10-08 19:03:36 +00:00
parent 9c47418b7c
commit 96b225d3ec
1 changed files with 22 additions and 29 deletions
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51
src/apps/bin/printenv.c
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@ -12,7 +12,7 @@
//
// ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
#include <OS.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -20,58 +20,51 @@
extern char **environ;
void print_env(char *);
void
usage()
{
printf("usage: printenv [VARIABLE]\n"
"If no environment VARIABLE is specified, print them all.\n");
}
int print_env(char *);
int
main(int argc, char *argv[])
{
if (argc > 2)
usage();
char *arg = (argc == 2 ? argv[1] : NULL);
else {
char *arg = (argc == 2 ? argv[1] : NULL);
if (arg && !strcmp(arg, "--help"))
usage();
print_env(arg);
if ((argc > 2) || (arg && !strcmp(arg, "--help"))) {
printf("usage: printenv [VARIABLE]\n"
"If no environment VARIABLE is specified, print them all.\n");
return 1;
}
return 0;
return print_env(arg);
}
void
int
print_env(char *arg)
{
char **env = environ;
if (arg) {
if (arg == NULL) {
// print all environment 'key=value' pairs (one per line)
while (*env)
printf("%s\n", *env++);
return 0;
}
else {
// print only the value of the specified variable
char *s;
int len = strlen(arg);
int len = strlen(arg);
bool found = false;
while ((s = *env++) != NULL)
if (!strncmp(s, arg, len)) {
char *p = strchr(s, '=');
if (p) {
printf("%s\n", p+1);
break;
found = true;
}
}
}
else {
// print all environment 'key=value' pairs (one per line)
while (*env)
printf("%s\n", *env++);
return found ? 0 : 1;
}
}