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/*********************************************************************
* bfs *
* Copyright (C) 2016 Tavian Barnes <tavianator@tavianator.com> *
* *
* This program is free software. It comes without any warranty, to *
* the extent permitted by applicable law. You can redistribute it *
* and/or modify it under the terms of the Do What The Fuck You Want *
* To Public License, Version 2, as published by Sam Hocevar. See *
* the COPYING file or http://www.wtfpl.net/ for more details. *
*********************************************************************/
#include "util.h"
#include "bftw.h"
#include <errno.h>
#include <fcntl.h>
#include <regex.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
int xreaddir(DIR *dir, struct dirent **de) {
errno = 0;
*de = readdir(dir);
if (!*de && errno != 0) {
return -1;
} else {
return 0;
}
}
char *xreadlinkat(int fd, const char *path, size_t size) {
++size; // NUL-terminator
ssize_t len;
char *name = NULL;
while (true) {
char *new_name = realloc(name, size);
if (!new_name) {
goto error;
}
name = new_name;
len = readlinkat(fd, path, name, size);
if (len < 0) {
goto error;
} else if (len >= size) {
size *= 2;
} else {
break;
}
}
name[len] = '\0';
return name;
error:
free(name);
return NULL;
}
bool isopen(int fd) {
return fcntl(fd, F_GETFD) >= 0 || errno != EBADF;
}
int redirect(int fd, const char *path, int flags, ...) {
close(fd);
mode_t mode = 0;
if (flags & O_CREAT) {
va_list args;
va_start(args, flags);
// Use int rather than mode_t, because va_arg must receive a
// fully-promoted type
mode = va_arg(args, int);
va_end(args);
}
int ret = open(path, flags, mode);
if (ret >= 0 && ret != fd) {
int other = ret;
ret = dup2(other, fd);
if (close(other) != 0) {
ret = -1;
}
}
return ret;
}
int dup_cloexec(int fd) {
#ifdef F_DUPFD_CLOEXEC
return fcntl(fd, F_DUPFD_CLOEXEC, 0);
#else
int ret = dup(fd);
if (ret < 0) {
return -1;
}
if (fcntl(ret, F_SETFD, FD_CLOEXEC) == -1) {
close(ret);
return -1;
}
return ret;
#endif
}
char *xregerror(int err, const regex_t *regex) {
size_t len = regerror(err, regex, NULL, 0);
char *str = malloc(len);
if (str) {
regerror(err, regex, str, len);
}
return str;
}
int xlocaltime(const time_t *timep, struct tm *result) {
// Should be called before localtime_r() according to POSIX.1-2004
tzset();
if (localtime_r(timep, result)) {
return 0;
} else {
return -1;
}
}
void format_mode(mode_t mode, char str[11]) {
strcpy(str, "----------");
switch (bftw_mode_to_typeflag(mode)) {
case BFTW_BLK:
str[0] = 'b';
break;
case BFTW_CHR:
str[0] = 'c';
break;
case BFTW_DIR:
str[0] = 'd';
break;
case BFTW_DOOR:
str[0] = 'D';
break;
case BFTW_FIFO:
str[0] = 'p';
break;
case BFTW_LNK:
str[0] = 'l';
break;
case BFTW_SOCK:
str[0] = 's';
break;
default:
break;
}
if (mode & 00400) {
str[1] = 'r';
}
if (mode & 00200) {
str[2] = 'w';
}
if ((mode & 04100) == 04000) {
str[3] = 'S';
} else if (mode & 04000) {
str[3] = 's';
} else if (mode & 00100) {
str[3] = 'x';
}
if (mode & 00040) {
str[4] = 'r';
}
if (mode & 00020) {
str[5] = 'w';
}
if ((mode & 02010) == 02000) {
str[6] = 'S';
} else if (mode & 02000) {
str[6] = 's';
} else if (mode & 00010) {
str[6] = 'x';
}
if (mode & 00004) {
str[7] = 'r';
}
if (mode & 00002) {
str[8] = 'w';
}
if ((mode & 01001) == 01000) {
str[9] = 'T';
} else if (mode & 01000) {
str[9] = 't';
} else if (mode & 00001) {
str[9] = 'x';
}
}
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