/** * mds — A micro-display server * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "mds-kbdc.h" #include #include #include #include #include #include #include #include /** * The number of elements in `argv` */ static int argc; /** * The command line arguments */ static char** argv; /** * Read the content of a file, ignoring interruptions * * @param pathname The file to read * @param size Output parameter for the size of the read content, in char:s * @return The read content, `NULL` on error */ static char* read_file(const char* restrict pathname, size_t* restrict size) { size_t buf_size = 8096; size_t buf_ptr = 0; char* restrict content = NULL; char* restrict old = NULL; int fd = -1; ssize_t got; /* Allocate buffer for the file's content. */ fail_if (xmalloc(content, buf_size, char)); /* Open the file to compile. */ fail_if ((fd = open(pathname, O_RDONLY)) < 0); /* Read the file to compile. */ for (;;) { /* Make sure the buffer is not small. */ if (buf_size - buf_ptr < 2048) { old = content; fail_if (xrealloc(content, buf_size <<= 1, char)); old = NULL; } /* Read a chunk of the file. */ got = read(fd, content + buf_ptr, (buf_size - buf_ptr) * sizeof(char)); if ((got < 0) && (errno == EINTR)) continue; else if (got < 0) goto pfail; else if (got == 0) break; buf_ptr += (size_t)got; } /* Shrink the buffer so it is not excessively large. */ fail_if (xrealloc(content, buf_ptr, char)); /* Close file decriptor for the file. */ close(fd); *size = buf_ptr; return content; pfail: xperror(*argv); free(old); free(content); if (fd >= 0) close(fd); return NULL; } /** * Compile a keyboard layout file * * @param argc_ The number of elements in `argv_` * @param argv_ The command line arguments * @return Zero on and only one success */ int main(int argc_, char** argv_) { const char* pathname = argv_[1]; char* restrict content = NULL; size_t content_size; argc = argc_; argv = argv_; content = read_file(pathname, &content_size); fail_if (content == NULL); return 0; pfail: xperror(*argv); return 1; }