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