diff options
Diffstat (limited to 'pw/fileupd.c')
| -rw-r--r-- | pw/fileupd.c | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/pw/fileupd.c b/pw/fileupd.c deleted file mode 100644 index b88f4fa..0000000 --- a/pw/fileupd.c +++ /dev/null @@ -1,203 +0,0 @@ -/*- - * Copyright (C) 1996 - * David L. Nugent. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#ifndef lint -static const char rcsid[] = - "$FreeBSD$"; -#endif /* not lint */ - -#include <stdio.h> -#include <fcntl.h> -#include <stdlib.h> -#include <string.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <sys/param.h> -#include <errno.h> -#include <unistd.h> - -#include "pwupd.h" - -int -extendline(char **buf, int * buflen, int needed) -{ - if (needed > *buflen) { - char *tmp = realloc(*buf, needed); - if (tmp == NULL) - return -1; - *buf = tmp; - *buflen = needed; - } - return *buflen; -} - -int -extendarray(char ***buf, int * buflen, int needed) -{ - if (needed > *buflen) { - char **tmp = realloc(*buf, needed * sizeof(char *)); - if (tmp == NULL) - return -1; - *buf = tmp; - *buflen = needed; - } - return *buflen; -} - - -int -fileupdate(char const * filename, mode_t fmode, char const * newline, char const * prefix, int pfxlen, int updmode) -{ - int rc = 0; - - if (pfxlen <= 1) - rc = EINVAL; - else { - int infd = open(filename, O_RDWR | O_CREAT | O_EXLOCK, fmode); - - if (infd == -1) - rc = errno; - else { - FILE *infp = fdopen(infd, "r+"); - - if (infp == NULL) { - rc = errno; /* Assumes fopen(3) sets errno from open(2) */ - close(infd); - } else { - int outfd; - char file[MAXPATHLEN]; - - strcpy(file, filename); - strcat(file, ".new"); - outfd = open(file, O_RDWR | O_CREAT | O_TRUNC, fmode); - if (outfd == -1) - rc = errno; - else { - FILE *outfp = fdopen(outfd, "w+"); - - if (outfp == NULL) { - rc = errno; - close(outfd); - } else { - int updated = UPD_CREATE; - int linesize = PWBUFSZ; - char *line = malloc(linesize); - - nextline: - while (fgets(line, linesize, infp) != NULL) { - char *p = strchr(line, '\n'); - - while ((p = strchr(line, '\n')) == NULL) { - int l; - if (extendline(&line, &linesize, linesize + PWBUFSZ) == -1) { - int ch; - fputs(line, outfp); - while ((ch = fgetc(infp)) != EOF) { - fputc(ch, outfp); - if (ch == '\n') - break; - } - goto nextline; - } - l = strlen(line); - if (fgets(line + l, linesize - l, infp) == NULL) - break; - } - if (*line != '#' && *line != '\n') { - if (!updated && strncmp(line, prefix, pfxlen) == 0) { - updated = updmode == UPD_REPLACE ? UPD_REPLACE : UPD_DELETE; - - /* - * Only actually write changes if updating - */ - if (updmode == UPD_REPLACE) - strcpy(line, newline); - else if (updmode == UPD_DELETE) - continue; - } - } - fputs(line, outfp); - } - - /* - * Now, we need to decide what to do: If we are in - * update mode, and no record was updated, then error If - * we are in insert mode, and record already exists, - * then error - */ - if (updmode != updated) - /* -1 return means: - * update,delete=no user entry - * create=entry exists - */ - rc = -1; - else { - - /* - * If adding a new record, append it to the end - */ - if (updmode == UPD_CREATE) - fputs(newline, outfp); - - /* - * Flush the file and check for the result - */ - if (fflush(outfp) == EOF) - rc = errno; /* Failed to update */ - else { - /* - * Copy data back into the - * original file and truncate - */ - rewind(infp); - rewind(outfp); - while (fgets(line, linesize, outfp) != NULL) - fputs(line, infp); - - /* - * If there was a problem with copying - * we will just rename 'file.new' - * to 'file'. - * This is a gross hack, but we may have - * corrupted the original file - */ - if (fflush(infp) == EOF || ferror(infp)) - rename(file, filename); - else - ftruncate(infd, ftell(infp)); - } - } - free(line); - fclose(outfp); - } - remove(file); - } - fclose(infp); - } - } - } - return rc; -} |