thodg/got/lib/path.c

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• Hash : 31cedeaf
  Author :
  Date : 2018-09-15T19:42:15
  

  add path filtering support to commit graph

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• lib/path.c

• /*
   * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
   * Copyright (c) 2015 Theo de Raadt <deraadt@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 <stdio.h>
  #include <string.h>
  
  #include "got_error.h"
  
  #include "got_lib_path.h"
  
  int
  got_path_is_absolute(const char *path)
  {
  	return path[0] == '/';
  }
  
  char *
  got_path_get_absolute(const char *relpath) 
  {
  	char cwd[PATH_MAX];
  	char *abspath;
  
  	if (getcwd(cwd, sizeof(cwd)) == NULL)
  		return NULL;
  
  	if (asprintf(&abspath, "%s/%s/", cwd, relpath) == -1)
  		return NULL;
  
  	return abspath;
  }
  
  char *
  got_path_normalize(const char *path)
  {
  	char *resolved;
  
  	resolved = realpath(path, NULL);
  	if (resolved == NULL)
  		return NULL;
  	
  	if (!got_path_is_absolute(resolved)) {
  		char *abspath = got_path_get_absolute(resolved);
  		free(resolved);
  		resolved = abspath;
  	}
  
  	return resolved;
  }
  
  /* based on canonpath() from kern_pledge.c */
  const struct got_error *
  got_canonpath(const char *input, char *buf, size_t bufsize)
  {
  	const char *p;
  	char *q;
  
  	/* can't canon relative paths, don't bother */
  	if (!got_path_is_absolute(input)) {
  		if (strlcpy(buf, input, bufsize) >= bufsize)
  			return got_error(GOT_ERR_NO_SPACE);
  		return NULL;
  	}
  
  	p = input;
  	q = buf;
  	while (*p && (q - buf < bufsize)) {
  		if (p[0] == '/' && (p[1] == '/' || p[1] == '\0')) {
  			p += 1;
  
  		} else if (p[0] == '/' && p[1] == '.' &&
  		    (p[2] == '/' || p[2] == '\0')) {
  			p += 2;
  
  		} else if (p[0] == '/' && p[1] == '.' && p[2] == '.' &&
  		    (p[3] == '/' || p[3] == '\0')) {
  			p += 3;
  			if (q != buf)	/* "/../" at start of buf */
  				while (*--q != '/')
  					continue;
  
  		} else {
  			*q++ = *p++;
  		}
  	}
  	if ((*p == '\0') && (q - buf < bufsize)) {
  		*q = 0;
  		return NULL;
  	} else
  		return got_error(GOT_ERR_NO_SPACE);
  }
  
  const struct got_error *
  got_path_skip_common_ancestor(char **child, const char *parent_abspath,
      const char *abspath)
  {
  	const struct got_error *err = NULL;
  	size_t len_parent, len, bufsize;
  
  	len_parent = strlen(parent_abspath);
  	len = strlen(abspath);
  	if (len_parent >= len)
  		return got_error(GOT_ERR_BAD_PATH);
  	if (strncmp(parent_abspath, abspath, len_parent) != 0)
  		return got_error(GOT_ERR_BAD_PATH);
  	if (abspath[len_parent] != '/')
  		return got_error(GOT_ERR_BAD_PATH);
  	bufsize = len - len_parent + 1;
  	*child = malloc(bufsize);
  	if (*child == NULL)
  		return got_error_from_errno();
  	if (strlcpy(*child, abspath + len_parent, bufsize) >= bufsize) {
  		err = got_error_from_errno();
  		free(*child);
  		*child = NULL;
  		return err;
  	}
  	return NULL;
  }
  
  int
  got_path_is_root_dir(const char *path)
  {
  	return (path[0] == '/' && path[1] == '\0');
  }
  

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