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#include "fileutils.h"
#include "alloc.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <pwd.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
const char* get_home_dir(void) {
const char *home_dir = getenv("HOME");
if(!home_dir) {
struct passwd *pw = getpwuid(getuid());
home_dir = pw->pw_dir;
}
return home_dir;
}
int file_get_content(const char *filepath, char **data, long *size) {
int result = 0;
FILE *file = fopen(filepath, "rb");
if(!file) {
int err = -errno;
/*perror(filepath);*/
return err;
}
fseek(file, 0, SEEK_END);
*size = ftell(file);
if(*size == -1) {
fprintf(stderr, "Failed to tell the size of file %s, is it not a file?\n", filepath);
result = -1;
goto cleanup;
}
fseek(file, 0, SEEK_SET);
*data = alloc_or_crash(*size + 1);
if((long)fread(*data, 1, *size, file) != *size) {
fprintf(stderr, "Failed to read all bytes in file %s\n", filepath);
result = -1;
goto cleanup;
}
(*data)[*size] = '\0';
cleanup:
fclose(file);
return result;
}
int create_directory_recursive(char *path) {
int path_len = strlen(path);
char *p = path;
char *end = path + path_len;
for(;;) {
char *slash_p = strchr(p, '/');
// Skips first '/', we don't want to try and create the root directory
if(slash_p == path) {
++p;
continue;
}
if(!slash_p)
slash_p = end;
char prev_char = *slash_p;
*slash_p = '\0';
int err = mkdir(path, S_IRWXU);
*slash_p = prev_char;
if(err == -1 && errno != EEXIST)
return err;
if(slash_p == end)
break;
else
p = slash_p + 1;
}
return 0;
}
int file_exists(const char *path) {
return access(path, F_OK);
}
int create_lock_file(const char *path) {
int fd = open(path, O_CREAT | O_EXCL | O_SYNC, 0666);
if(fd == -1)
return errno;
return close(fd);
}
int file_overwrite(const char *filepath, const char *data, size_t size) {
FILE *file = fopen(filepath, "wb");
if(!file) {
int err = -errno;
perror(filepath);
return err;
}
unsigned long bytes_written = fwrite(data, 1, size, file);
if(bytes_written != size) {
fprintf(stderr, "Failed to write all bytes to file %s. Expected to write %zu bytes, only wrote %zu bytes\n", filepath, size, (size_t)bytes_written);
fclose(file);
return -1;
}
fclose(file);
return 0;
}
int file_overwrite_in_dir(const char *dir, const char *filename, const char *data, size_t size) {
char filepath[PATH_MAX];
const char *filepath_components[] = { dir, filename };
int filepath_len = path_join(filepath, filepath_components, 2);
char tmp_filepath[PATH_MAX];
strcpy(tmp_filepath, filepath);
strcpy(tmp_filepath + filepath_len, ".tmp");
int result = file_overwrite(tmp_filepath, data, size);
if(result != 0)
return result;
/* Rename is atomic! */
return rename(tmp_filepath, filepath);
}
int path_join(char *output, const char **components, int num_components) {
int offset = 0;
for(int i = 0; i < num_components; ++i) {
if(i > 0) {
output[offset] = '/';
++offset;
}
int component_len = strlen(components[i]);
memcpy(output + offset, components[i], component_len);
offset += component_len;
}
output[offset] = '\0';
return offset;
}
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