skalibs

Mirror/fork of https://skarnet.org/software/skalibs/
git clone https://ccx.te2000.cz/git/skalibs
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openwritenclose5.c (718B)

      1 /* ISC license. */
      2 
      3 #include <string.h>
      4 #include <stdio.h>
      5 #include <stdlib.h>
      6 
      7 #include <skalibs/posixplz.h>
      8 #include <skalibs/devino.h>
      9 #include <skalibs/djbunix.h>
     10 
     11 #define SUFFIX ":skalibs-openwritenclose:XXXXXX"
     12 
     13 int openwritenclose5 (char const *fn, char const *s, size_t n, devino *devino, unsigned int options)
     14 {
     15   int fd ;
     16   size_t fnlen = strlen(fn) ;
     17   char tmp[fnlen + sizeof(SUFFIX)] ;
     18   memcpy(tmp, fn, fnlen) ;
     19   memcpy(tmp + fnlen, SUFFIX, sizeof(SUFFIX)) ;
     20   fd = mkstemp(tmp) ;
     21   if (fd < 0) return 0 ;
     22   if (!writenclose_unsafe5(fd, s, n, devino, options)) goto failclose ;
     23   if (rename(tmp, fn) < 0) goto fail ;
     24   return 1 ;
     25 
     26  failclose:
     27   fd_close(fd) ;
     28  fail:
     29   unlink_void(tmp) ;
     30   return 0 ;
     31 }