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core: stream: replaced cached cursor counter with a tell() function callback

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max 🍓
2025-07-31 11:13:40 +01:00
parent 771044a95a
commit 67392d12e6
2 changed files with 28 additions and 1 deletions
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1
core/include/blue/core/stream.h
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@@ -45,6 +45,7 @@ typedef struct b_stream {
b_status (*s_close)(struct b_stream *);
b_status (*s_seek)(struct b_stream *, long long, b_stream_seek_origin);
b_status (*s_tell)(const struct b_stream *, size_t *);
b_status (*s_getc)(struct b_stream *, int *);
b_status (*s_read)(struct b_stream *, unsigned char *, size_t, size_t *);
b_status (*s_write)(

28
core/stream.c
View File

@@ -68,23 +68,38 @@ static enum b_status stdio_seek(
return B_SUCCESS;
}
static enum b_status stdio_tell(const struct b_stream *stream, size_t *cursor)
{
FILE *fp = stream->s_ptr;
long pos = ftell(fp);
if (pos == -1L) {
return B_ERR_NOT_SUPPORTED;
}
*cursor = (size_t)pos;
return B_SUCCESS;
}
static struct b_stream stdio[] = {
[IDX_STDIN] = {
.s_mode = B_STREAM_READ,
.s_read = stdio_read,
.s_seek = stdio_seek,
.s_tell = stdio_tell,
.s_ptr = NULL, /* set to stdin (stdio.h) at runtime */
},
[IDX_STDOUT] = {
.s_mode = B_STREAM_WRITE,
.s_write = stdio_write,
.s_seek = stdio_seek,
.s_tell = stdio_tell,
.s_ptr = NULL, /* set to stdout (stdio.h) at runtime */
},
[IDX_STDERR] = {
.s_mode = B_STREAM_WRITE,
.s_write = stdio_write,
.s_seek = stdio_seek,
.s_tell = stdio_tell,
.s_ptr = NULL, /* set to stderr (stdio.h) at runtime */
},
};
@@ -169,6 +184,7 @@ struct b_stream *b_stream_open_fp(FILE *fp)
stream->s_read = stdio_read;
stream->s_write = stdio_write;
stream->s_seek = stdio_seek;
stream->s_tell = stdio_tell;
return stream;
}
@@ -211,7 +227,17 @@ enum b_status b_stream_seek(
size_t b_stream_cursor(const b_stream *stream)
{
return stream->s_cursor;
if (!stream->s_tell) {
return 0;
}
size_t cursor = 0;
enum b_status status = stream->s_tell(stream, &cursor);
if (!B_OK(status)) {
return 0;
}
return cursor;
}
enum b_status b_stream_push_indent(b_stream *stream, int indent)