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#define _POSIX_C_SOURCE 200809L
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
static char *g_name = "touch";
void fatal(const char *format, ...)
{
va_list ap;
va_start(ap, format);
fprintf(stderr, "%s: ", g_name);
vfprintf(stderr, format, ap);
fputc('\n', stderr);
va_end(ap);
exit(EXIT_FAILURE);
}
enum flags
{
FLAG_ACCESS_ONLY = 1 << 0,
FLAG_MODIFICATION_ONLY = 1 << 1,
FLAG_NO_CREATE = 1 << 2,
FLAG_NO_DEREFERENCE = 1 << 3,
};
int main(int argc, char **argv)
{
int option;
enum flags flags = 0;
char *reference_filepath = NULL;
g_name = argv[0];
while ((option = getopt(argc, argv, "acd:fhr:t")) != -1)
{
switch (option)
{
case 'a': flags |= FLAG_ACCESS_ONLY; break;
case 'm': flags |= FLAG_MODIFICATION_ONLY; break;
case 'c': flags |= FLAG_NO_CREATE; break;
case 'h': flags |= FLAG_NO_DEREFERENCE; break;
case 'd': exit(1); break;
case 't': exit(1); break;
case 'r': reference_filepath = optarg; break;
case 'f': break;
}
}
if (optind == argc)
fatal("missing file operand");
struct timeval times[2];
if (reference_filepath != NULL)
{
struct stat statbuf;
if (stat(reference_filepath, &statbuf) == -1)
fatal("%s", strerror(errno));
times[0].tv_sec = statbuf.st_atim.tv_sec;
times[0].tv_usec = statbuf.st_atim.tv_nsec / 1000;
times[1].tv_sec = statbuf.st_mtim.tv_sec;
times[1].tv_usec = statbuf.st_mtim.tv_nsec / 1000;
}
else
{
struct timeval now;
gettimeofday(&now, NULL);
memcpy(×[0], &now, sizeof(struct timeval));
memcpy(×[1], &now, sizeof(struct timeval));
}
for (; optind < argc; optind++)
{
struct stat statbuf;
if (stat(argv[optind], &statbuf) == -1)
{
if (!(flags & FLAG_NO_CREATE))
if (close(creat(argv[optind], 0644)) == -1)
{
fprintf(stderr, "%s: cannot create '%s': %s", g_name, argv[optind], strerror(errno));
continue;
}
fprintf(stderr, "%s: cannot atouch '%s': %s", g_name, argv[optind], strerror(errno));
continue;
}
if (flags & FLAG_ACCESS_ONLY)
{
times[1].tv_sec = statbuf.st_mtim.tv_sec;
times[1].tv_usec = statbuf.st_mtim.tv_nsec / 1000;
}
else if (flags & FLAG_MODIFICATION_ONLY)
{
times[0].tv_sec = statbuf.st_atim.tv_sec;
times[0].tv_usec = statbuf.st_atim.tv_nsec / 1000;
}
if (utimes(argv[optind], times) == -1)
fprintf(stderr, "%s: cannot touch '%s': %s", g_name, argv[optind], strerror(errno));
}
return EXIT_SUCCESS;
}
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