105 lines
2.1 KiB
C
Executable File
105 lines
2.1 KiB
C
Executable File
/*
|
|
* wmfs2 by Martin Duquesnoy <xorg62@gmail.com> { for(i = 2011; i < 2111; ++i) ©(i); }
|
|
* For license, see COPYING.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "util.h"
|
|
|
|
/** malloc with error support and size_t overflow protection
|
|
* \param nmemb number of objects
|
|
* \param size size of single object
|
|
* \return non null void pointer
|
|
*/
|
|
void*
|
|
xmalloc(size_t nmemb, size_t size)
|
|
{
|
|
void *ret;
|
|
|
|
if(SIZE_MAX / nmemb < size)
|
|
err(EXIT_FAILURE, "xmalloc(%zu, %zu), "
|
|
"size_t overflow detected", nmemb, size);
|
|
|
|
if((ret = malloc(nmemb * size)) == NULL)
|
|
err(EXIT_FAILURE, "malloc(%zu)", nmemb * size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/** calloc with error support
|
|
* \param nmemb Number of objects
|
|
* \param size size of single object
|
|
* \return non null void pointer
|
|
*/
|
|
void*
|
|
xcalloc(size_t nmemb, size_t size)
|
|
{
|
|
void *ret;
|
|
|
|
if((ret = calloc(nmemb, size)) == NULL)
|
|
err(EXIT_FAILURE, "calloc(%zu * %zu)", nmemb, size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/** asprintf wrapper
|
|
* \param strp target string
|
|
* \param fmt format
|
|
* \return non zero integer
|
|
*/
|
|
int
|
|
xasprintf(char **strp, const char *fmt, ...)
|
|
{
|
|
int ret;
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
ret = vasprintf(strp, fmt, args);
|
|
va_end(args);
|
|
|
|
if (ret == -1)
|
|
err(EXIT_FAILURE, "asprintf(%s)", fmt);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/** Execute a system command
|
|
* \param cmd Command
|
|
* \return child pid
|
|
*/
|
|
pid_t
|
|
spawn(const char *format, ...)
|
|
{
|
|
char *sh = NULL;
|
|
char cmd[512];
|
|
va_list ap;
|
|
pid_t pid;
|
|
size_t len;
|
|
|
|
va_start(ap, format);
|
|
len = vsnprintf(cmd, sizeof(cmd), format, ap);
|
|
va_end(ap);
|
|
|
|
if (len >= sizeof(cmd))
|
|
{
|
|
warnx("command too long (> 512 bytes)");
|
|
return -1;
|
|
}
|
|
|
|
if(!(sh = getenv("SHELL")))
|
|
sh = "/bin/sh";
|
|
|
|
if((pid = fork()) == 0)
|
|
{
|
|
setsid();
|
|
if (execl(sh, sh, "-c", cmd, (char*)NULL) == -1)
|
|
warn("execl(sh -c %s)", cmd);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
else if (pid == -1)
|
|
warn("fork");
|
|
|
|
return pid;
|
|
}
|