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/*
* Copyright (c) 2017 Gilles Chehade <gilles@poolp.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 <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static void file_engine(const char *);
int
main(int argc, char *argv[])
{
int ch;
while ((ch = getopt(argc, argv, "")) != -1) {
switch (ch) {
default:
break;
}
}
argc -= optind;
argv += optind;
if (argc == 0)
errx(1, "mail.file: filename required");
if (argc != 0)
errx(1, "mail.file: only one filename is supported");
file_engine(argv[0]);
return (0);
}
static void
file_engine(const char *filename)
{
int fd;
FILE *fp;
char *line = NULL;
size_t linesize = 0;
ssize_t linelen;
int n;
struct stat sb;
int escaped = 0;
fd = open(filename, O_CREAT | O_APPEND | O_WRONLY, 0600);
if (fd < 0)
err(1, NULL);
if (fstat(fd, &sb) < 0)
err(1, NULL);
if (S_ISREG(sb.st_mode) && flock(fd, LOCK_EX) < 0)
err(1, NULL);
if ((fp = fdopen(fd, "a")) == NULL)
err(1, NULL);
while ((linelen = getline(&line, &linesize, stdin)) != -1) {
line[strcspn(line, "\n")] = '\0';
if (strncasecmp(line, "From ", 5) == 0) {
if (!escaped)
escaped = 1;
else
fprintf(fp, ">");
}
fprintf(fp, "%s\n", line);
}
free(line);
if (ferror(stdin))
goto truncate;
if (fflush(fp) == -1)
if (errno != EINVAL)
goto truncate;
if (fclose(fp) == EOF)
goto truncate;
exit(0);
truncate:
n = errno;
ftruncate(fd, sb.st_size);
errno = n;
err(1, NULL);
}
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