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