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fc9cf5c931
There is at least one user of the buffer API that reuse a single buffer by just resetting `buf.len` to `0`. This works as long as the new user of the buffer actually adds something to the buffer. However, if we don't add anything but still provide `buf.buf` to a consumer, the old content will be re-used. This patch thus adds two new clearing variants to the buffer API: - `buf_clear()` which doesn't reset the internal allocations - `buf_reset()` which does free the internal allocations Additionally, this patch makes `buffer_add_char()` public which allows adding single characters to an existing buffer. This will be used in a future PR which implements custom format strings for the OSD.
67 lines
1.2 KiB
C
67 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Very simple C string buffer implementation
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*
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* Copyright Johan Malm 2020
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*/
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#ifndef LABWC_BUF_H
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#define LABWC_BUF_H
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct buf {
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char *buf;
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int alloc;
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int len;
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};
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/**
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* buf_expand_tilde - expand ~ in buffer
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* @s: buffer
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*/
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void buf_expand_tilde(struct buf *s);
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/**
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* buf_expand_shell_variables - expand $foo and ${foo} in buffer
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* @s: buffer
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* Note: $$ is not handled
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*/
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void buf_expand_shell_variables(struct buf *s);
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/**
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* buf_init - allocate NULL-terminated C string buffer
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* @s: buffer
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* Note: use free(s->buf) to free it
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*/
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void buf_init(struct buf *s);
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/**
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* buf_add - add data to C string buffer
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* @s: buffer
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* @data: data to be added
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*/
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void buf_add(struct buf *s, const char *data);
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/**
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* buf_add_char - add single char to C string buffer
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* @s: buffer
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* @data: char to be added
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*/
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void buf_add_char(struct buf *s, char data);
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/**
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* buf_clear - clear the buffer, internal allocations are preserved
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* @s: buffer
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*/
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void buf_clear(struct buf *s);
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/**
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* buf_reset - reset the buffer, internal allocations are free'd
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* @s: buffer
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*/
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void buf_reset(struct buf *s);
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#endif /* LABWC_BUF_H */
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