74 lines
1.1 KiB
C
74 lines
1.1 KiB
C
#include "less.h"
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#include "xbuf.h"
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/*
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* Initialize an expandable text buffer.
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*/
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public void
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xbuf_init(xbuf)
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struct xbuffer *xbuf;
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{
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xbuf->data = NULL;
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xbuf->size = xbuf->end = 0;
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}
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public void
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xbuf_deinit(xbuf)
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struct xbuffer *xbuf;
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{
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if (xbuf->data != NULL)
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free(xbuf->data);
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xbuf_init(xbuf);
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}
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public void
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xbuf_reset(xbuf)
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struct xbuffer *xbuf;
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{
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xbuf->end = 0;
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}
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/*
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* Add a char to an expandable text buffer.
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*/
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public void
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xbuf_add(xbuf, ch)
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struct xbuffer *xbuf;
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int ch;
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{
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if (xbuf->end >= xbuf->size)
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{
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char *data;
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xbuf->size = (xbuf->size == 0) ? 16 : xbuf->size * 2;
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data = (char *) ecalloc(xbuf->size, sizeof(char));
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if (xbuf->data != NULL)
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{
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memcpy(data, xbuf->data, xbuf->end);
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free(xbuf->data);
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}
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xbuf->data = data;
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}
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xbuf->data[xbuf->end++] = ch;
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}
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public int
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xbuf_pop(buf)
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struct xbuffer *buf;
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{
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if (buf->end == 0)
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return -1;
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return buf->data[--(buf->end)];
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}
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public void
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xbuf_set(dst, src)
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struct xbuffer *dst;
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struct xbuffer *src;
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{
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int i;
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xbuf_reset(dst);
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for (i = 0; i < src->end; i++)
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xbuf_add(dst, src->data[i]);
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}
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