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/*
* Copyright (C) 2021 Jo-Philipp Wich <jo@mein.io>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <string.h>
#include "source.h"
uc_source *
uc_source_new_file(const char *path)
{
FILE *fp = fopen(path, "rb");
uc_source *src;
if (!fp)
return NULL;
src = xalloc(ALIGN(sizeof(*src)) + strlen(path) + 1);
src->fp = fp;
src->buffer = NULL;
src->filename = strcpy((char *)src + ALIGN(sizeof(*src)), path);
src->usecount = 1;
src->lineinfo.count = 0;
src->lineinfo.entries = NULL;
return src;
}
uc_source *
uc_source_new_buffer(const char *name, char *buf, size_t len)
{
FILE *fp = fmemopen(buf, len, "rb");
uc_source *src;
if (!fp)
return NULL;
src = xalloc(ALIGN(sizeof(*src)) + strlen(name) + 1);
src->fp = fp;
src->buffer = buf;
src->filename = strcpy((char *)src + ALIGN(sizeof(*src)), name);
src->usecount = 1;
src->lineinfo.count = 0;
src->lineinfo.entries = NULL;
return src;
}
size_t
uc_source_get_line(uc_source *source, size_t *offset)
{
uc_lineinfo *lines = &source->lineinfo;
size_t i, pos = 0, line = 0, lastoff = 0;
for (i = 0; i < lines->count; i++) {
if (lines->entries[i] & 0x80) {
lastoff = pos;
line++;
pos++;
}
pos += (lines->entries[i] & 0x7f);
if (pos >= *offset) {
*offset -= lastoff - 1;
return line;
}
}
return 0;
}
uc_source *
uc_source_get(uc_source *source)
{
if (!source)
return NULL;
source->usecount++;
return source;
}
void
uc_source_put(uc_source *source)
{
if (!source)
return;
if (source->usecount > 1) {
source->usecount--;
return;
}
uc_vector_clear(&source->lineinfo);
fclose(source->fp);
free(source->buffer);
free(source);
}
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