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which.c
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C/C++ Source or Header
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1990-07-23
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79 lines
/* which - search paths for executable */
#define DELIMITER ':'
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
int main(ac, av)
char **av;
{
char *path, *cp;
char buf[400];
char prog[400];
char patbuf[512];
int quit, none;
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)
printf("No %s in %s\n", *av, getenv("PATH"));
break;
}
}
}
exit(0);
}