| [9] | 1 | /* which - search paths for executable */
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| 2 |
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| 3 | #define DELIMITER ':'
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| 4 |
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| 5 | #include <sys/types.h>
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| 6 | #include <stdlib.h>
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| 7 | #include <string.h>
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| 8 | #include <unistd.h>
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| 9 | #include <stdio.h>
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| 10 |
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| 11 | _PROTOTYPE(int main, (int argc, char **argv));
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| 12 |
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| 13 | int main(ac, av)
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| 14 | int ac;
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| 15 | char **av;
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| 16 | {
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| 17 | char *path, *cp;
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| 18 | char buf[400];
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| 19 | char prog[400];
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| 20 | char patbuf[512];
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| 21 | int quit, none;
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| 22 | int excode = 0;
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| 23 |
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| 24 | if (ac < 2) {
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| 25 | fprintf(stderr, "Usage: %s cmd [cmd, ..]\n", *av);
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| 26 | exit(1);
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| 27 | }
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| 28 | av[ac] = 0;
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| 29 | for (av++; *av; av++) {
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| 30 |
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| 31 | quit = 0;
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| 32 | none = 1;
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| 33 | if ((path = getenv("PATH")) == NULL) {
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| 34 | fprintf(stderr, "Null path.\n");
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| 35 | exit(0);
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| 36 | }
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| 37 | strcpy(patbuf, path);
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| 38 | path = patbuf;
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| 39 | cp = path;
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| 40 |
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| 41 | while (1) {
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| 42 | cp = strchr(path, DELIMITER);
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| 43 | if (cp == NULL)
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| 44 | quit++;
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| 45 | else
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| 46 | *cp = '\0';
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| 47 |
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| 48 | if (strcmp(path, "") == 0 && quit == 0) {
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| 49 | sprintf(buf, "%s./%s", path, *av);
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| 50 | } else
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| 51 | sprintf(buf, "%s/%s", path, *av);
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| 52 |
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| 53 | /* Fprintf(stderr,"Trying %s, path %s\n",buf,path); */
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| 54 |
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| 55 | path = ++cp;
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| 56 |
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| 57 | if (access(buf, 1) == 0) {
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| 58 | printf("%s\n", buf);
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| 59 | none = 0;
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| 60 | }
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| 61 | sprintf(prog, "%s.%s", buf, "prg");
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| 62 | if (access(prog, 1) == 0) {
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| 63 | printf("%s\n", prog);
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| 64 | none = 0;
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| 65 | }
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| 66 | sprintf(prog, "%s.%s", buf, "ttp");
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| 67 | if (access(prog, 1) == 0) {
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| 68 | printf("%s\n", prog);
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| 69 | none = 0;
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| 70 | }
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| 71 | sprintf(prog, "%s.%s", buf, "tos");
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| 72 | if (access(prog, 1) == 0) {
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| 73 | printf("%s\n", prog);
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| 74 | none = 0;
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| 75 | }
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| 76 | if (quit) {
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| 77 | if (none) {
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| 78 | fprintf(stderr, "No %s in %s\n", *av, getenv("PATH"));
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| 79 | excode = 1;
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| 80 | }
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| 81 | break;
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| 82 | }
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| 83 | }
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| 84 | }
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| 85 | return(excode);
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| 86 | }
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