thodg/got/lib/opentemp.c

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• Hash : a558dd1b
  Author :
  Date : 2022-06-08T10:56:53
  

  reuse a temporary file across commits during got log -p -S suggested by + ok op@

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• lib/opentemp.c

• /*
   * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <limits.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <string.h>
  #include <stdio.h>
  
  #include "got_opentemp.h"
  #include "got_error.h"
  
  int
  got_opentempfd(void)
  {
  	char name[PATH_MAX];
  	int fd;
  
  	if (strlcpy(name, GOT_TMPDIR_STR "/got.XXXXXXXX", sizeof(name))
  	    >= sizeof(name))
  		return -1;
  
  	fd = mkstemp(name);
  	if (fd != -1)
  		unlink(name);
  	return fd;
  }
  
  FILE *
  got_opentemp(void)
  {
  	int fd;
  	FILE *f;
  
  	fd = got_opentempfd();
  	if (fd < 0)
  		return NULL;
  
  	f = fdopen(fd, "w+");
  	if (f == NULL) {
  		close(fd);
  		return NULL;
  	}
  
  	return f;
  }
  
  const struct got_error *
  got_opentemp_named(char **path, FILE **outfile, const char *basepath)
  {
  	const struct got_error *err = NULL;
  	int fd;
  
  	*outfile = NULL;
  
  	if (asprintf(path, "%s-XXXXXX", basepath) == -1) {
  		*path = NULL;
  		return got_error_from_errno("asprintf");
  	}
  
  	fd = mkstemp(*path);
  	if (fd == -1) {
  		err = got_error_from_errno2("mkstemp", *path);
  		free(*path);
  		*path = NULL;
  		return err;
  	}
  
  	*outfile = fdopen(fd, "w+");
  	if (*outfile == NULL) {
  		err = got_error_from_errno2("fdopen", *path);
  		free(*path);
  		*path = NULL;
  	}
  
  	return err;
  }
  
  const struct got_error *
  got_opentemp_named_fd(char **path, int *outfd, const char *basepath)
  {
  	const struct got_error *err = NULL;
  	int fd;
  
  	*outfd = -1;
  
  	if (asprintf(path, "%s-XXXXXX", basepath) == -1) {
  		*path = NULL;
  		return got_error_from_errno("asprintf");
  	}
  
  	fd = mkstemp(*path);
  	if (fd == -1) {
  		err = got_error_from_errno("mkstemp");
  		free(*path);
  		*path = NULL;
  		return err;
  	}
  
  	*outfd = fd;
  	return err;
  }
  
  const struct got_error *
  got_opentemp_truncate(FILE *f)
  {
  	if (fpurge(f) == EOF)
  		return got_error_from_errno("fpurge");
  	if (ftruncate(fileno(f), 0L) == -1)
  		return got_error_from_errno("ftruncate");
  	if (fseeko(f, 0L, SEEK_SET) == -1)
  		return got_error_from_errno("fseeko");
  	return NULL;
  }
  

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