69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/* simple UNX program to work together with 'comm' */
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#include <stdio.h>
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#include <fcntl.h>
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static char **build_argv(int bufsize, char *command, int len)
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/* routine returns **argv for use with execv routines */
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{
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int offset = ((len+4) / 4) * 4; /* aligned offset for **argv */
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int components = (bufsize - offset) / 4;
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if (components-- > 1) { /* minimal argv[0] + NULL */
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char **argv = (char **)(command+offset);
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char **pp = argv;
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char *p = command;
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char c;
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int i=0;
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*pp = p;
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*(p+len) = 0;
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while ((0 != (c = *p++)) && i < components) {
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if (c == 10 || c == 13) {
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*(p-1) = '\0';
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break;
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} else if (c == 32 || c == '\t') {
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*(p-1) = '\0';
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if (*p != 32 && *p != '\t' && *p != 10 && *p != 13) {
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*(++pp)=p;
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i++;
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}
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} else if (!i && c == '/') { /* here i must get argv[0] */
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*pp=p;
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}
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}
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if (*pp && !**pp) *pp=NULL;
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else
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*(++pp)=NULL;
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return(argv);
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}
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return(NULL);
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}
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#define MAXARGLEN 1024
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int main(int argc, char *argv[])
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{
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int status=fcntl(0, F_GETFL);
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int size;
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char buf[MAXARGLEN+1024];
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if (status != -1) fcntl(0, F_SETFL, status|O_NONBLOCK);
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close(2);
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dup2(1,2);
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if (-1 < (size=read(0, buf, MAXARGLEN))){
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char **argvv=build_argv(sizeof(buf), buf, size);
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if (argvv) {
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char path[300];
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execv(buf, argvv);
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sprintf(path, "/usr/bin/%s", *argvv);
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execv(path, argvv);
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sprintf(path, "/bin/%s", *argvv);
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execv(path, argvv);
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sprintf(path, "/usr/sbin/%s", *argvv);
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execv(path, argvv);
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sprintf(path, "/sbin/%s", *argvv);
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execv(path, argvv);
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fprintf(stderr, "%s:\tCould not find program '%s'\n", *argv, buf);
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exit(1);
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}
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}
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fprintf(stderr, "%s:\tGot no paras\n", *argv);
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exit(1);
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}
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