87 lines
1.5 KiB
C
87 lines
1.5 KiB
C
/* which - search paths for executable */
|
|
|
|
#define DELIMITER ':'
|
|
|
|
#include <sys/types.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
|
|
int main(int argc, char **argv);
|
|
|
|
int main(ac, av)
|
|
int ac;
|
|
char **av;
|
|
{
|
|
char *path, *cp;
|
|
char buf[400];
|
|
char prog[400];
|
|
char patbuf[512];
|
|
int quit, none;
|
|
int excode = 0;
|
|
|
|
if (ac < 2) {
|
|
fprintf(stderr, "Usage: %s cmd [cmd, ..]\n", *av);
|
|
exit(1);
|
|
}
|
|
av[ac] = 0;
|
|
for (av++; *av; av++) {
|
|
|
|
quit = 0;
|
|
none = 1;
|
|
if ((path = getenv("PATH")) == NULL) {
|
|
fprintf(stderr, "Null path.\n");
|
|
exit(0);
|
|
}
|
|
strcpy(patbuf, path);
|
|
path = patbuf;
|
|
cp = path;
|
|
|
|
while (1) {
|
|
cp = strchr(path, DELIMITER);
|
|
if (cp == NULL)
|
|
quit++;
|
|
else
|
|
*cp = '\0';
|
|
|
|
if (strcmp(path, "") == 0 && quit == 0) {
|
|
sprintf(buf, "%s./%s", path, *av);
|
|
} else
|
|
sprintf(buf, "%s/%s", path, *av);
|
|
|
|
/* Fprintf(stderr,"Trying %s, path %s\n",buf,path); */
|
|
|
|
path = ++cp;
|
|
|
|
if (access(buf, 1) == 0) {
|
|
printf("%s\n", buf);
|
|
none = 0;
|
|
}
|
|
sprintf(prog, "%s.%s", buf, "prg");
|
|
if (access(prog, 1) == 0) {
|
|
printf("%s\n", prog);
|
|
none = 0;
|
|
}
|
|
sprintf(prog, "%s.%s", buf, "ttp");
|
|
if (access(prog, 1) == 0) {
|
|
printf("%s\n", prog);
|
|
none = 0;
|
|
}
|
|
sprintf(prog, "%s.%s", buf, "tos");
|
|
if (access(prog, 1) == 0) {
|
|
printf("%s\n", prog);
|
|
none = 0;
|
|
}
|
|
if (quit) {
|
|
if (none) {
|
|
fprintf(stderr, "No %s in %s\n", *av, getenv("PATH"));
|
|
excode = 1;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return(excode);
|
|
}
|