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#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "jv.h"
#include "jv_unicode.h"
jv jv_load_file(const char* filename, int raw) {
struct stat sb;
int fd = open(filename, O_RDONLY);
if (fd == -1) {
return jv_invalid_with_msg(jv_string_fmt("Could not open %s: %s",
filename,
strerror(errno)));
}
if (fstat(fd, &sb) == -1 || S_ISDIR(sb.st_mode)) {
close(fd);
return jv_invalid_with_msg(jv_string_fmt("Could not open %s: %s",
filename,
"It's a directory"));
}
FILE* file = fdopen(fd, "r");
struct jv_parser* parser = NULL;
jv data;
if (!file) {
close(fd);
return jv_invalid_with_msg(jv_string_fmt("Could not open %s: %s",
filename,
strerror(errno)));
}
if (raw) {
data = jv_string("");
} else {
data = jv_array();
parser = jv_parser_new(0);
}
// To avoid mangling UTF-8 multi-byte sequences that cross the end of our read
// buffer, we need to be able to read the remainder of a sequence and add that
// before appending.
const int max_utf8_len = 4;
char buf[4096+max_utf8_len];
while (!feof(file) && !ferror(file)) {
size_t n = fread(buf, 1, sizeof(buf)-max_utf8_len, file);
int len = 0;
if (n == 0)
continue;
if (jvp_utf8_backtrack(buf+(n-1), buf, &len) && len > 0 &&
!feof(file) && !ferror(file)) {
n += fread(buf+n, 1, len, file);
}
if (raw) {
data = jv_string_append_buf(data, buf, n);
} else {
jv_parser_set_buf(parser, buf, n, !feof(file));
jv value;
while (jv_is_valid((value = jv_parser_next(parser))))
data = jv_array_append(data, value);
if (jv_invalid_has_msg(jv_copy(value))) {
jv_free(data);
data = value;
break;
}
}
}
if (!raw)
jv_parser_free(parser);
int badread = ferror(file);
if (fclose(file) != 0 || badread) {
jv_free(data);
return jv_invalid_with_msg(jv_string_fmt("Error reading from %s",
filename));
}
return data;
}
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