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/* DSV.c
*
* Copyright (c) 2016 Tharre
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
#include "dbg.h"
#include "DSV.h"
/* dest must be 2x src */
size_t encode_string(char *dest, const char *src) {
char *start = dest, c;
while ((c = *(src++))) {
switch (c) {
case '\n':
*(dest++) = '\\';
*(dest++) = 'n';
break;
case '\\':
*(dest++) = '\\';
*(dest++) = '\\';
break;
case ':':
*(dest++) = '\\';
/* fall-through */
default:
*(dest++) = c;
}
}
*dest = '\0';
return dest - start;
}
static void decode_string(char *dest, const char *src, size_t len) {
for (size_t i = 0; i < len-1; ++i) {
char c = src[i];
if (c != '\\') {
*(dest++) = c;
continue;
}
/* check if we are at the end of the string */
if (*src == '\0') {
debug("DSV: ignored extra '\\' at end of string\n");
break;
}
switch (c = *(src++)) {
case 'n':
*(dest++) = '\n';
break;
default:
*(dest++) = c;
}
}
*dest = '\0';
}
void dsv_init(struct dsv_ctx *ctx, size_t fields_count) {
ctx->fields_count = fields_count;
ctx->fields = xmalloc(fields_count * sizeof(char*));
ctx->offset = 0;
ctx->bufsize = 1024;
ctx->buf = xmalloc(ctx->bufsize);
ctx->buflen = 0;
}
void dsv_free(struct dsv_ctx *ctx) {
free(ctx->fields);
free(ctx->buf);
}
int dsv_parse_next_line(struct dsv_ctx *context, const char *src, size_t len) {
char *newline = memchr(src, '\n', len);
if (!newline) {
context->status = E_NO_NEWLINE_FOUND;
return 1;
}
context->processed = newline-src+1;
if (context->processed == 1) {
debug("DSV: empty newline detected\n");
context->status = E_EMPTY_NEWLINE;
return 1;
}
char *start = (char*) src;
size_t i = 0;
ptrdiff_t size;
while (1) {
char *colon = memchr(start, ':', newline-start+1);
if (colon)
size = colon-start;
else
size = newline-start;
if (size <= 0) {
if (!size) {
debug("DSV: empty field detected\n");
context->status = E_EMPTY_FIELD;
goto error;
}
break;
}
char *buf = xmalloc(size+1);
decode_string(buf, start, size+1);
context->fields[i] = buf;
start += size + 1;
++i;
if (i > context->fields_count) {
debug("DSV: too many fields\n");
context->status = E_TOO_MANY_FIELDS;
goto error;
}
}
if (i+1 < context->fields_count) {
debug("DSV: too few fields (%zu)\n", i+1);
context->status = E_TOO_FEW_FIELDS;
goto error;
}
context->status = E_SUCCESS;
return 0;
error:
for (size_t j = 0; j < i; ++j)
free(context->fields[j]);
return 1;
}
int dsv_parse_file(struct dsv_ctx *ctx, FILE *fp) {
size_t read = ctx->buflen;
if (!read) {
read = fread(ctx->buf, 1, ctx->bufsize, fp);
ctx->buflen = read;
}
while (read > 0) {
if (dsv_parse_next_line(ctx, ctx->buf+ctx->offset, read-ctx->offset)) {
if (ctx->status != E_NO_NEWLINE_FOUND)
return 1;
/* are we using the full buffer already? */
if (!ctx->offset) {
/* then make it bigger! */
ctx->bufsize *= 2;
ctx->buf = xrealloc(ctx->buf, ctx->bufsize);
} else {
/* then move stuff around */
memmove(ctx->buf, ctx->buf+ctx->offset, read-ctx->offset);
ctx->buflen -= ctx->offset;
ctx->offset = 0;
}
read = fread(ctx->buf+ctx->buflen, 1, ctx->bufsize-ctx->buflen, fp);
ctx->buflen += read;
} else {
ctx->offset += ctx->processed;
ctx->status = E_SUCCESS;
return 0;
}
}
if (ferror(fp)) {
ctx->status = E_FREAD_ERROR;
return 1;
}
return 1;
}
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