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/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* file_loader
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* - shared memory based file loader
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*
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* Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "file_loader.h"
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#include "log.h"
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#include "str_process.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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struct shm_header_t
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{
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size_t shm_size;
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size_t data_len;
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long line_total;
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};
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int load_file(const char *filename)
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{
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char filepath[FILE_PATH_LEN];
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char shm_name[FILE_PATH_LEN];
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int fd;
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struct stat sb;
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void *p_data;
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size_t data_len;
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size_t size;
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void *p_shm;
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long line_total;
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long line_offsets[MAX_SPLIT_FILE_LINES];
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long *p_line_offsets;
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if (filename == NULL)
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{
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log_error("NULL pointer error\n");
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return -1;
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}
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if ((fd = open(filename, O_RDONLY)) < 0)
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{
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log_error("open(%s) error (%d)\n", filename, errno);
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return -1;
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}
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if (fstat(fd, &sb) < 0)
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{
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log_error("fstat(fd) error (%d)\n", errno);
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close(fd);
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return -1;
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}
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data_len = (size_t)sb.st_size;
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p_data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, fd, 0L);
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if (p_data == MAP_FAILED)
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{
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log_error("mmap() error (%d)\n", errno);
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close(fd);
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return -2;
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}
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if (close(fd) < 0)
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{
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log_error("close(fd) error (%d)\n", errno);
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return -1;
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}
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line_total = split_data_lines(p_data, SCREEN_COLS, line_offsets, MAX_SPLIT_FILE_LINES, 1, NULL);
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// Allocate shared memory
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size = sizeof(struct shm_header_t) + data_len + 1 + sizeof(long) * (size_t)(line_total + 1);
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if (unload_file(filename) < 0)
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{
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return -2;
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}
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strncpy(filepath, filename, sizeof(filepath) - 1);
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filepath[sizeof(filepath) - 1] = '\0';
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snprintf(shm_name, sizeof(shm_name), "/%s", basename(filepath));
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if ((fd = shm_open(shm_name, O_CREAT | O_EXCL | O_RDWR, 0600)) == -1)
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{
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log_error("shm_open(%s) error (%d)\n", shm_name, errno);
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return -2;
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}
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if (ftruncate(fd, (off_t)size) == -1)
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{
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log_error("ftruncate(size=%d) error (%d)\n", size, errno);
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close(fd);
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return -2;
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}
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p_shm = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0L);
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if (p_shm == MAP_FAILED)
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{
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log_error("mmap() error (%d)\n", errno);
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close(fd);
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return -2;
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}
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if (close(fd) < 0)
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{
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log_error("close(fd) error (%d)\n", errno);
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return -1;
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}
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((struct shm_header_t *)p_shm)->shm_size = size;
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((struct shm_header_t *)p_shm)->data_len = data_len;
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((struct shm_header_t *)p_shm)->line_total = line_total;
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memcpy((char *)p_shm + sizeof(struct shm_header_t), p_data, data_len);
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if (munmap(p_data, data_len) < 0)
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{
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log_error("munmap() error (%d)\n", errno);
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munmap(p_shm, size);
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return -2;
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}
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p_data = (char *)p_shm + sizeof(struct shm_header_t);
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p_line_offsets = (long *)((char *)p_data + data_len + 1);
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memcpy(p_line_offsets, line_offsets, sizeof(long) * (size_t)(line_total + 1));
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if (munmap(p_shm, size) < 0)
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{
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log_error("munmap() error (%d)\n", errno);
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return -2;
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}
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return 0;
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}
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int unload_file(const char *filename)
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{
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char filepath[FILE_PATH_LEN];
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char shm_name[FILE_PATH_LEN];
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if (filename == NULL)
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{
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log_error("NULL pointer error\n");
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return -1;
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}
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strncpy(filepath, filename, sizeof(filepath) - 1);
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filepath[sizeof(filepath) - 1] = '\0';
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snprintf(shm_name, sizeof(shm_name), "/%s", basename(filepath));
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if (shm_unlink(shm_name) == -1 && errno != ENOENT)
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{
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log_error("shm_unlink(%s) error (%d)\n", shm_name, errno);
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return -2;
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}
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return 0;
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}
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void *get_file_shm_readonly(const char *filename, size_t *p_data_len, long *p_line_total, const void **pp_data, const long **pp_line_offsets)
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{
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char filepath[FILE_PATH_LEN];
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char shm_name[FILE_PATH_LEN];
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int fd;
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void *p_shm = NULL;
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struct stat sb;
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size_t size;
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if (filename == NULL || p_data_len == NULL || p_line_total == NULL || pp_data == NULL || pp_line_offsets == NULL)
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{
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log_error("NULL pointer error\n");
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return NULL;
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}
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strncpy(filepath, filename, sizeof(filepath) - 1);
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filepath[sizeof(filepath) - 1] = '\0';
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snprintf(shm_name, sizeof(shm_name), "/%s", basename(filepath));
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if ((fd = shm_open(shm_name, O_RDONLY, 0600)) == -1)
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{
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log_error("shm_open(%s) error (%d)\n", shm_name, errno);
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return NULL;
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}
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if (fstat(fd, &sb) < 0)
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{
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log_error("fstat(fd) error (%d)\n", errno);
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close(fd);
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return NULL;
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}
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size = (size_t)sb.st_size;
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p_shm = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0L);
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if (p_shm == MAP_FAILED)
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{
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log_error("mmap() error (%d)\n", errno);
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close(fd);
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return NULL;
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}
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if (close(fd) < 0)
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{
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log_error("close(fd) error (%d)\n", errno);
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return NULL;
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}
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if (((struct shm_header_t *)p_shm)->shm_size != size)
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{
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log_error("Shared memory size mismatch (%ld != %ld)\n", ((struct shm_header_t *)p_shm)->shm_size, size);
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munmap(p_shm, size);
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return NULL;
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}
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*p_data_len = ((struct shm_header_t *)p_shm)->data_len;
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*p_line_total = ((struct shm_header_t *)p_shm)->line_total;
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*pp_data = (char *)p_shm + sizeof(struct shm_header_t);
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*pp_line_offsets = (const long *)((const char *)(*pp_data) + *p_data_len + 1);
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return p_shm;
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}
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int detach_file_shm(void *p_shm)
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{
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size_t size;
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if (p_shm == NULL)
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{
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return -1;
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}
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size = ((struct shm_header_t *)p_shm)->shm_size;
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if (munmap(p_shm, size) < 0)
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{
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log_error("munmap() error (%d)\n", errno);
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return -2;
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}
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return 0;
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}
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