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/*
Copyright 2008, 2010, 2012 Lukas Mai.
This file is part of unibilium.
Unibilium is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Unibilium is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with unibilium. If not, see <http://www.gnu.org/licenses/>.
*/
#include "unibilium.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifndef TERMINFO_DIRS
#error "internal error: TERMINFO_DIRS is not defined"
#endif
enum {MAX_BUF = 4096};
const char *const unibi_terminfo_dirs = TERMINFO_DIRS;
unibi_term *unibi_from_fp(FILE *fp) {
char buf[MAX_BUF];
size_t n, r;
for (n = 0; n < sizeof buf && (r = fread(buf + n, 1, sizeof buf - n, fp)) > 0; ) {
n += r;
if (feof(fp)) {
break;
}
}
if (ferror(fp)) {
return NULL;
}
return unibi_from_mem(buf, n);
}
unibi_term *unibi_from_fd(int fd) {
char buf[MAX_BUF];
size_t n;
ssize_t r;
for (n = 0; n < sizeof buf && (r = read(fd, buf + n, sizeof buf - n)) > 0; ) {
n += r;
}
if (r < 0) {
return NULL;
}
return unibi_from_mem(buf, n);
}
unibi_term *unibi_from_file(const char *file) {
int fd;
unibi_term *ut;
if ((fd = open(file, O_RDONLY)) < 0) {
return NULL;
}
ut = unibi_from_fd(fd);
close(fd);
return ut;
}
static int add_overflowed(size_t *dst, size_t src) {
*dst += src;
return *dst < src;
}
static unibi_term *from_dir(const char *dir_begin, const char *dir_end, const char *mid, const char *term) {
char *path;
unibi_term *ut;
size_t dir_len, mid_len, term_len, path_size;
dir_len = dir_end ? (size_t)(dir_end - dir_begin) : strlen(dir_begin);
mid_len = mid ? strlen(mid) + 1 : 0;
term_len = strlen(term);
path_size = 0;
if (
add_overflowed(&path_size, dir_len) ||
add_overflowed(&path_size, mid_len) ||
add_overflowed(&path_size, term_len) ||
add_overflowed(&path_size, 1 + 2 + 1 + 1)
/* / (%c | %02x) / \0 */
) {
/* overflow */
errno = ENOMEM;
return NULL;
}
if (!(path = malloc(path_size))) {
return NULL;
}
memcpy(path, dir_begin, dir_len);
sprintf(path + dir_len, "/" "%s" "%s" "%c" "/" "%s",
mid ? mid : "", mid ? "/" : "", term[0], term);
errno = 0;
ut = unibi_from_file(path);
if (!ut && errno == ENOENT) {
/* OS X likes to use /usr/share/terminfo/<hexcode>/name instead of the first letter */
sprintf(path + dir_len + 1 + mid_len, "%02x/%s",
(unsigned int)((unsigned char)term[0] & 0xff),
term);
ut = unibi_from_file(path);
}
free(path);
return ut;
}
static unibi_term *from_dirs(const char *list, const char *term) {
const char *a, *z;
if (list[0] == '\0') {
errno = ENOENT;
return NULL;
}
a = list;
for (;;) {
unibi_term *ut;
while (*a == ':') {
++a;
}
if (*a == '\0') {
break;
}
z = strchr(a, ':');
ut = from_dir(a, z, NULL, term);
if (ut) {
return ut;
}
if (!z) {
break;
}
a = z + 1;
}
errno = ENOENT;
return NULL;
}
unibi_term *unibi_from_term(const char *term) {
unibi_term *ut;
const char *env;
assert(term != NULL);
if (term[0] == '\0' || term[0] == '.' || strchr(term, '/')) {
errno = EINVAL;
return NULL;
}
if ((env = getenv("TERMINFO"))) {
return from_dir(env, NULL, NULL, term);
}
if ((env = getenv("HOME"))) {
ut = from_dir(env, NULL, ".terminfo", term);
if (ut) {
return ut;
}
}
if ((env = getenv("TERMINFO_DIRS"))) {
return from_dirs(env, term);
}
return from_dirs(unibi_terminfo_dirs, term);
}
unibi_term *unibi_from_env(void) {
const char *term = getenv("TERM");
if (!term) {
errno = ENOENT;
return NULL;
}
return unibi_from_term(term);
}
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