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#include "csv.h"
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
struct csv_reader {
const char *p;
const char *end;
};
typedef struct {
char *data;
size_t len;
size_t cap;
} csv_buf_t;
csv_reader_t *csv_reader_new(const char *data, size_t len)
{
csv_reader_t *reader;
if (data == NULL)
return NULL;
reader = calloc(1, sizeof(*reader));
if (reader == NULL)
return NULL;
reader->p = data;
reader->end = data + len;
if (len >= 3 && memcmp(data, "\xEF\xBB\xBF", 3) == 0)
reader->p += 3;
return reader;
}
void csv_reader_free(csv_reader_t *reader)
{
free(reader);
}
void csv_row_free(csv_row_t *row)
{
size_t i;
if (row == NULL)
return;
for (i = 0; i < row->count; i++)
free(row->fields[i]);
free(row->fields);
row->fields = NULL;
row->count = 0;
}
static bool buf_push(csv_buf_t *buf, char c)
{
if (buf->len + 2 > buf->cap) {
size_t cap = buf->cap ? buf->cap * 2 : 32;
char *grown = realloc(buf->data, cap);
if (grown == NULL)
return false;
buf->data = grown;
buf->cap = cap;
}
buf->data[buf->len++] = c;
buf->data[buf->len] = '\0';
return true;
}
static bool row_push(csv_row_t *row, size_t *cap, char *field)
{
if (row->count + 1 > *cap) {
size_t next = *cap ? *cap * 2 : 16;
char **grown = realloc(row->fields, next * sizeof(*grown));
if (grown == NULL)
return false;
row->fields = grown;
*cap = next;
}
row->fields[row->count++] = field;
return true;
}
static char *parse_field(csv_reader_t *reader)
{
csv_buf_t field = {NULL, 0, 0};
bool quoted = false;
if (!buf_push(&field, '\0'))
return NULL;
field.len = 0;
field.data[0] = '\0';
if (reader->p < reader->end && *reader->p == '"') {
quoted = true;
reader->p++;
}
while (reader->p < reader->end) {
char c = *reader->p;
if (quoted) {
reader->p++;
if (c != '"') {
if (!buf_push(&field, c))
goto fail;
continue;
}
if (reader->p < reader->end && *reader->p == '"') {
reader->p++;
if (!buf_push(&field, '"'))
goto fail;
continue;
}
quoted = false;
continue;
}
if (c == ',' || c == '\n' || c == '\r')
break;
reader->p++;
if (!buf_push(&field, c))
goto fail;
}
if (quoted)
goto fail;
return field.data;
fail:
free(field.data);
return NULL;
}
int csv_reader_next(csv_reader_t *reader, csv_row_t *out)
{
csv_row_t row = {NULL, 0};
size_t cap = 0;
if (reader == NULL || out == NULL)
return -1;
if (reader->p >= reader->end)
return 0;
for (;;) {
char *field = parse_field(reader);
if (field == NULL) {
csv_row_free(&row);
return -1;
}
if (!row_push(&row, &cap, field)) {
free(field);
csv_row_free(&row);
return -1;
}
if (reader->p >= reader->end)
break;
if (*reader->p == ',') {
reader->p++;
continue;
}
if (*reader->p == '\r')
reader->p++;
if (reader->p < reader->end && *reader->p == '\n')
reader->p++;
break;
}
*out = row;
return 1;
}
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