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- /*
- * wmfs2 by Martin Duquesnoy <xorg62@gmail.com> { for(i = 2011; i < 2111; ++i) ©(i); }
- * For license, see COPYING.
- */
- #define _GNU_SOURCE /* vasprintf() */
- #include <stdint.h>
- #include <string.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;
- }
- /** strdup with error support
- * \param str char pointer
- * \retun non null void pointer
- */
- char *
- xstrdup(const char *str)
- {
- char *ret;
- if (str == NULL || (ret = strdup(str)) == NULL)
- err(EXIT_FAILURE, "strdup(%s)", str);
- 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;
- }
- void
- uicb_spawn(Uicb cmd)
- {
- spawn("%s", cmd);
- }
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