Книга: UNIX — универсальная среда программирования

3.8.51 sv.c

3.8.51 sv.c
/* sv: save new files */
#include <stdio.h>
#include <sys/types.h>
#include <sys/dir.h>
#include <sys/stat.h>
char *progname;
main(argc, argv)
 int argc;
 char *argv[];
{
 int i;
 struct stat stbuf;
 char *dir = argv[argc-1];
 progname = argv[0];
 if (argc <= 2)
  error ("Usage: %s files... dir", progname);
 if (stat(dir, festbuf) == -1)
  error("can't access directory %s", dir);
 if ((stbuf.st_mode & S_IFMT) != S_IFDIR)
  error("%s is not a directory", dir);
 for (i = 1; i < argc-1; i++)
  sv(argv[i], dir);
 exit(0);
}
sv(file, dir) /* save file in dir */
 char *file, *dir;
{
 struct stat sti, sto;
 int fin, fout, n;
 char target[BUFSIZ], buf[BUFSIZ], *index();
 sprintf(target, "%s/%s", dir, file);
 if (index(file, '/') != NULL) /* strchr() in some systems */
  error("won't handle '/'s in %s", file);
 if (stat(file, &sti) == -1)
  error("can't stat %s", file);
 if (stat(target, &sto) == -1) /* target not present */
  sto.st_mtime = 0; /* so make it look old */
 if (sti.st_mtime < sto.st_mtime) /* target is newer */
  fprintf(stderr, "%s: %s not copiedn", progname, file);
 else if ((fin = open(file, 0)) == -1)
  error("can't open file %s", file);
 else if ((fout = creat(target, sti.st_mode)) == -1)
  error("can't create %s", target);
 while ((n = read(fin, buf, sizeof buf)) > 0)
  if (write(fout, buf, n) != n)
   error("error writing %s", target);
 close(fin);
 close(fout);
}
#include "error.c"

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