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authorAryadev Chavali <aryadev@aryadevchavali.com>2025-09-01 21:26:01 +0100
committerAryadev Chavali <aryadev@aryadevchavali.com>2025-09-01 21:26:01 +0100
commit700c3b1d1b3ed835ffab3fd502ab91baba8e2d1f (patch)
tree69029747231d8fa60d3cb05f965e796d2211f021 /stream.c
parentcc56a2ee2b5703f9ea5ac63a86870af188845c30 (diff)
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Move implementation files into their own folder
main.c and test.c generate binary executables so they can stay in the main folder, but the rest can go into their own dedicated folder to make it look nicer
Diffstat (limited to 'stream.c')
-rw-r--r--stream.c296
1 files changed, 0 insertions, 296 deletions
diff --git a/stream.c b/stream.c
deleted file mode 100644
index a7fb72e..0000000
--- a/stream.c
+++ /dev/null
@@ -1,296 +0,0 @@
-/* Copyright (C) 2025 Aryadev Chavali
-
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE. See the Unlicense for details.
-
- * You may distribute and modify this code under the terms of the Unlicense,
- * which you should have received a copy of along with this program. If not,
- * please go to <https://unlicense.org/>.
-
- * Created: 2025-08-26
- * Description: Stream implementation
- */
-
-#include <string.h>
-
-#include "./alisp.h"
-
-stream_err_t stream_init_string(stream_t *stream, char *name, sv_t contents)
-{
- if (!stream)
- return STREAM_ERR_INVALID_PTR;
- name = name ? name : "<stream>";
- memset(stream, 0, sizeof(*stream));
-
- stream->type = STREAM_TYPE_STRING;
- stream->name = name;
- stream->string = contents;
-
- return STREAM_ERR_OK;
-}
-
-stream_err_t stream_init_file(stream_t *stream, char *name, FILE *pipe)
-{
- if (!stream || !pipe)
- return STREAM_ERR_INVALID_PTR;
- name = name ? name : "<stream>";
- memset(stream, 0, sizeof(*stream));
-
- stream->type = STREAM_TYPE_FILE;
- stream->name = name;
- stream->pipe.file = pipe;
-
- vec_init(&stream->pipe.cache, STREAM_DEFAULT_CHUNK);
-
- return STREAM_ERR_OK;
-}
-
-void stream_stop(stream_t *stream)
-{
- if (!stream)
- return;
- switch (stream->type)
- {
- case STREAM_TYPE_STRING:
- // Nothing to do, all dealt with outside of stream
- break;
- case STREAM_TYPE_FILE:
- // Must cleanup vector
- vec_free(&stream->pipe.cache);
- break;
- }
- memset(stream, 0, sizeof(*stream));
-}
-
-u64 stream_size(stream_t *stream)
-{
- assert(stream);
- switch (stream->type)
- {
- case STREAM_TYPE_STRING:
- return stream->string.size;
- case STREAM_TYPE_FILE:
- return stream->pipe.cache.size;
- default:
- FAIL("Unreachable");
- return 0;
- }
-}
-
-bool stream_eos(stream_t *stream)
-{
- assert(stream);
- switch (stream->type)
- {
- case STREAM_TYPE_STRING:
- return stream->position >= stream->string.size;
- case STREAM_TYPE_FILE:
- return feof(stream->pipe.file);
- default:
- FAIL("Unreachable");
- return 0;
- }
-}
-
-bool stream_eoc(stream_t *stream)
-{
- assert(stream);
- switch (stream->type)
- {
- case STREAM_TYPE_STRING:
- return stream->position >= stream->string.size;
- case STREAM_TYPE_FILE:
- return stream->position >= stream->pipe.cache.size;
- default:
- FAIL("Unreachable");
- return 0;
- }
-}
-
-bool stream_chunk(stream_t *stream)
-{
- assert(stream);
- switch (stream->type)
- {
- case STREAM_TYPE_STRING:
- // vacuously true
- return true;
- case STREAM_TYPE_FILE:
- {
- if (feof(stream->pipe.file))
- return false;
- vec_ensure_free(&stream->pipe.cache, STREAM_DEFAULT_CHUNK);
- int read = fread(vec_data(&stream->pipe.cache), 1, STREAM_DEFAULT_CHUNK,
- stream->pipe.file);
- stream->pipe.cache.size += read;
- return true;
- }
- default:
- FAIL("Unreachable");
- return 0;
- }
-}
-
-char stream_next(stream_t *stream)
-{
- char c = stream_peek(stream);
- if (c != '\0')
- ++stream->position;
- return c;
-}
-
-char stream_peek(stream_t *stream)
-{
- if (stream_eos(stream))
- return '\0';
-
- switch (stream->type)
- {
- case STREAM_TYPE_STRING:
- return stream->string.data[stream->position];
- case STREAM_TYPE_FILE:
- {
- // Cached already? We are done.
- if (stream->position < stream->pipe.cache.size)
- return ((char *)vec_data(&stream->pipe.cache))[stream->position];
-
- // Try to read chunks in till we've reached it or we're at the end of the
- // file.
- for (bool read_chunk = stream_chunk(stream);
- read_chunk && stream->position >= stream->pipe.cache.size;
- read_chunk = stream_chunk(stream))
- continue;
-
- // Same principle as the stream_eos(stream) check.
- if (stream->position >= stream->pipe.cache.size)
- return '\0';
- return ((char *)vec_data(&stream->pipe.cache))[stream->position];
- }
- default:
- FAIL("Unreachable");
- return 0;
- }
-}
-
-bool stream_seek(stream_t *stream, i64 offset)
-{
- if (offset < 0)
- return stream_seek_backward(stream, offset * -1);
- else if (offset > 0)
- return stream_seek_forward(stream, offset);
- else
- // vacuously successful
- return true;
-}
-
-bool stream_seek_forward(stream_t *stream, u64 offset)
-{
- if (stream_eos(stream))
- return false;
- switch (stream->type)
- {
- case STREAM_TYPE_STRING:
- {
- if (stream->position + offset < stream->string.size)
- {
- stream->position += offset;
- return true;
- }
- return false;
- }
- case STREAM_TYPE_FILE:
- {
- // Similar principle as stream_peek really...
-
- // Cached already? We are done.
- if (stream->position + offset < stream->pipe.cache.size)
- {
- stream->position += offset;
- return true;
- }
-
- // Try to read chunks in till we've reached it or we're at the end of the
- // file.
- for (bool read_chunk = stream_chunk(stream);
- read_chunk && stream->position + offset >= stream->pipe.cache.size;
- read_chunk = stream_chunk(stream))
- continue;
-
- // Same principle as the stream_eos(stream) check.
- if (stream->position + offset >= stream->pipe.cache.size)
- return false;
- stream->position += offset;
- return true;
- }
- default:
- FAIL("Unreachable");
- return 0;
- }
-}
-
-bool stream_seek_backward(stream_t *stream, u64 offset)
-{
- assert(stream);
- if (stream->position < offset)
- return false;
- stream->position -= offset;
- return true;
-}
-
-sv_t stream_substr(stream_t *stream, u64 size)
-{
- if (stream_eos(stream))
- return SV(NULL, 0);
- u64 current_position = stream->position;
- bool successful = stream_seek_forward(stream, size);
- // In case we did happen to move forward
- stream->position = current_position;
- if (!successful)
- return SV(NULL, 0);
-
- char *ptr = NULL;
- switch (stream->type)
- {
- case STREAM_TYPE_STRING:
- ptr = stream->string.data;
- break;
- case STREAM_TYPE_FILE:
- ptr = vec_data(&stream->pipe.cache);
- break;
- default:
- FAIL("Unreachable");
- return SV(NULL, 0);
- }
-
- return SV(ptr + stream->position, size);
-}
-
-sv_t stream_substr_abs(stream_t *stream, u64 index, u64 size)
-{
-
- switch (stream->type)
- {
- case STREAM_TYPE_STRING:
- if (index + size < stream_size(stream))
- return SV(stream->string.data + index, size);
- return SV(NULL, 0);
- case STREAM_TYPE_FILE:
- {
- if (index + size < stream_size(stream))
- return SV(vec_data(&stream->pipe.cache) + index, size);
- // stream_size(stream) <= index + size => try reading chunks
- for (bool read_chunk = stream_chunk(stream);
- read_chunk && index + size >= stream->pipe.cache.size;
- read_chunk = stream_chunk(stream))
- continue;
-
- if (index + size >= stream_size(stream))
- return SV(NULL, 0);
- return SV(vec_data(&stream->pipe.cache) + index, size);
- }
- default:
- assert("Unreachable");
- return SV(NULL, 0);
- }
-}