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Changed to use alloca() instead of malloc() to allocate argument vectors.

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Programs that don't use malloc()/free() (ie. provide their own allocation
scheme atop sbrk()) should still be able to use exec*.
This commit is contained in:
jtc 1995-12-14 16:51:27 +00:00
parent 28db87de35
commit bdb00bc144
1 changed files with 55 additions and 58 deletions
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113
lib/libc/gen/exec.c
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@ -1,4 +1,4 @@
/* $NetBSD: exec.c,v 1.6 1995/02/27 03:42:57 cgd Exp $ */
/* $NetBSD: exec.c,v 1.7 1995/12/14 16:51:27 jtc Exp $ */
/*-
* Copyright (c) 1991, 1993
@ -37,7 +37,7 @@
#if 0
static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93";
#else
static char rcsid[] = "$NetBSD: exec.c,v 1.6 1995/02/27 03:42:57 cgd Exp $";
static char rcsid[] = "$NetBSD: exec.c,v 1.7 1995/12/14 16:51:27 jtc Exp $";
#endif
#endif /* LIBC_SCCS and not lint */
@ -58,39 +58,6 @@ static char rcsid[] = "$NetBSD: exec.c,v 1.6 1995/02/27 03:42:57 cgd Exp $";
extern char **environ;
static char **
buildargv(ap, arg, envpp)
va_list ap;
const char *arg;
char ***envpp;
{
static size_t memsize;
static char **argv;
register size_t off;
argv = NULL;
for (off = 0;; ++off) {
if (off >= memsize) {
memsize += 50; /* Starts out at 0. */
memsize *= 2; /* Ramp up fast. */
if (!(argv = realloc(argv, memsize * sizeof(char *)))) {
memsize = 0;
return (NULL);
}
if (off == 0) {
argv[0] = (char *)arg;
off = 1;
}
}
if (!(argv[off] = va_arg(ap, char *)))
break;
}
/* Get environment pointer if user supposed to provide one. */
if (envpp)
*envpp = va_arg(ap, char **);
return (argv);
}
int
#if __STDC__
execl(const char *name, const char *arg, ...)
@ -102,21 +69,31 @@ execl(name, arg, va_alist)
#endif
{
va_list ap;
int sverrno;
char **argv;
int i;
#if __STDC__
va_start(ap, arg);
#else
va_start(ap);
#endif
if (argv = buildargv(ap, arg, NULL))
(void)execve(name, argv, environ);
for (i = 1; va_arg(ap, char *) != NULL; i++)
;
va_end(ap);
sverrno = errno;
free(argv);
errno = sverrno;
return (-1);
argv = alloca (i * sizeof (char *));
#if __STDC__
va_start(ap, arg);
#else
va_start(ap);
#endif
argv[0] = (char *) arg;
for (i = 1; (argv[i] = (char *) va_arg(ap, char *)) != NULL; i++)
;
va_end(ap);
return execve(name, argv, environ);
}
int
@ -130,21 +107,32 @@ execle(name, arg, va_alist)
#endif
{
va_list ap;
int sverrno;
char **argv, **envp;
int i;
#if __STDC__
va_start(ap, arg);
#else
va_start(ap);
#endif
if (argv = buildargv(ap, arg, &envp))
(void)execve(name, argv, envp);
for (i = 1; va_arg(ap, char *) != NULL; i++)
;
va_end(ap);
sverrno = errno;
free(argv);
errno = sverrno;
return (-1);
argv = alloca (i * sizeof (char *));
#if __STDC__
va_start(ap, arg);
#else
va_start(ap);
#endif
argv[0] = (char *) arg;
for (i = 1; (argv[i] = (char *) va_arg(ap, char *)) != NULL; i++)
;
envp = (char **) va_arg(ap, char **);
va_end(ap);
return execve(name, argv, envp);
}
int
@ -158,21 +146,31 @@ execlp(name, arg, va_alist)
#endif
{
va_list ap;
int sverrno;
char **argv;
int i;
#if __STDC__
va_start(ap, arg);
#else
va_start(ap);
#endif
if (argv = buildargv(ap, arg, NULL))
(void)execvp(name, argv);
for (i = 1; va_arg(ap, char *) != NULL; i++)
;
va_end(ap);
sverrno = errno;
free(argv);
errno = sverrno;
return (-1);
argv = alloca (i * sizeof (char *));
#if __STDC__
va_start(ap, arg);
#else
va_start(ap);
#endif
argv[0] = (char *) arg;
for (i = 1; (argv[i] = va_arg(ap, char *)) != NULL; i++)
;
va_end(ap);
return execvp(name, argv);
}
int
@ -180,8 +178,7 @@ execv(name, argv)
const char *name;
char * const *argv;
{
(void)execve(name, argv, environ);
return (-1);
return execve(name, argv, environ);
}
int