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Copy pathlexerunix.c
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60 lines (53 loc) · 1.67 KB
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#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include "misc.h"
#include "lexer.h"
typedef struct _str_buf_t {
bool free; // free src_beg when done
const char *src_beg; // beginning of source
const char *src_cur; // current location in source
const char *src_end; // end (exclusive) of source
} str_buf_t;
unichar str_buf_next_char(str_buf_t *sb) {
if (sb->src_cur < sb->src_end) {
return *sb->src_cur++;
} else {
return MP_LEXER_CHAR_EOF;
}
}
void str_buf_free(str_buf_t *sb) {
if (sb) {
if (sb->free) {
m_del(char, (char*)sb->src_beg, 0 /* unknown size of src_beg */);
}
m_del_obj(str_buf_t, sb);
}
}
mp_lexer_t *mp_lexer_new_from_str_len(const char *src_name, const char *str, uint len, bool free_str) {
str_buf_t *sb = m_new(str_buf_t, 1);
sb->free = free_str;
sb->src_beg = str;
sb->src_cur = str;
sb->src_end = str + len;
return mp_lexer_new(src_name, sb, (mp_lexer_stream_next_char_t)str_buf_next_char, (mp_lexer_stream_close_t)str_buf_free);
}
mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
int fd = open(filename, O_RDONLY);
if (fd < 0) {
printf("cannot open file %s\n", filename);
return NULL;
}
uint size = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
char *data = m_new(char, size);
int read_size = read(fd, data, size);
close(fd);
if (read_size != size) {
printf("error reading file %s\n", filename);
m_del(char, data, size);
return NULL;
}
return mp_lexer_new_from_str_len(filename, data, size, true);
}