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Unix System Administration Handbook 1997 October
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libcnews
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mkinperm.c
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C/C++ Source or Header
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1994-11-27
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2KB
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76 lines
/*
- mkinperm - move in.coming temporary to a unique permanent name
*
* Names are based on the current time in hopes of keeping input in order.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include "fixerrno.h"
#ifndef EEXIST
#define EEXIST 0
#endif
#include "libc.h"
#include "news.h"
#include "config.h"
/* #include "mkinperm.h" */
#ifndef MAXTRIES
#define MAXTRIES 100 /* limit on attempts to make links */
#endif
int mkinpdebug = 0;
char *progname;
int /* true iff succeeded */
mkinperm(tmpname, grade, class)
char *tmpname;
char *grade; /* 3 chars = digit, period, NUL */
char *class; /* suffix for filename, default is plain text */
{
register char *p;
register char *name;
register int ntries;
register time_t now;
register int uniq = '0';
p = fullartfile("in.coming/");
name = nemalloc(strlen(p) + 20); /* plenty for a number */
(void) strcpy(name, p);
p = name + strlen(name);
now = time((time_t *)NULL);
for (ntries = 0; ; ntries++) {
(void) sprintf(p, "%s%ld%c%s", grade, now, uniq, class);
if (mkinpdebug)
(void) fprintf(stderr, "trying renaming to %s\n", name);
if (link(tmpname, name) >= 0)
break; /* NOTE BREAK OUT */
if (errno != EEXIST) /* something strange is wrong */
return NO;
errno = 0;
if (ntries > MAXTRIES) /* sanity check */
return NO;
if (++uniq == '9'+1)
uniq = 'a';
else if (uniq == 'z'+1)
uniq = 'A';
else if (uniq == 'Z'+1) {
(void) sleep(2);
now = time((time_t *)NULL);
uniq = '0';
}
if (mkinpdebug)
(void) fprintf(stderr, "link to %s failed\n", name);
}
if (mkinpdebug)
(void) fprintf(stderr, "succeeded\n");
(void) unlink(tmpname);
return YES;
}