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Length: 1040 (0x410)
Types: TextFile
Notes: UNIX file
Names: »execvp.c«
└─⟦f27320a65⟧ Bits:30001972 Commodore 900 hard disk image with partial source code
└─⟦f4b8d8c84⟧ UNIX V7 Filesystem
└─ ⟦this⟧ »libc/sys/execvp.c«
/*
* Version of execv that mimics the
* actions of the shell in using search
* rules and running a shell file.
*/
#include <stdio.h>
#include <errno.h>
#define NFNAME 100 /* Largest filename */
static char srch[] = ":/bin";
static char shell[] = "/bin/sh";
extern int errno;
execvp(name, argp)
char *name;
char *argp[];
{
char *getenv();
register char *p1, *p2;
register char *sp;
char fname[NFNAME];
if ((sp = getenv("PATH")) == NULL)
sp = srch;
for (;;) {
p2 = fname;
while (*sp!='\0' && *sp!=':')
*p2++ = *sp++;
p1 = name;
if (p2 != fname)
*p2++ = '/';
while (*p1 != '\0')
*p2++ = *p1++;
*p2 = '\0';
if (*name == '/') {
execv(name, argp);
if (errno != ENOEXEC)
break;
} else
execv(fname, argp);
if (errno == ENOEXEC) {
register char *sv1, *sv2;
sv1 = argp[-1];
sv2 = argp[0];
argp[-1] = shell;
argp[0] = fname;
execv(shell, argp-1);
argp[-1] = sv1;
argp[0] = sv2;
break;
}
if (*sp == '\0')
break;
if (*sp == ':')
sp++;
}
return (-1);
}