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158 lines
3.2 KiB
C
158 lines
3.2 KiB
C
#include "syshdrs.h"
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void
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FlushSReadlineInfo(SReadlineInfo *srl)
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{
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/* Discards any input left in the current buffer,
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* and resets the buffer and its pointer.
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*/
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srl->bufSize = srl->bufSizeMax;
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memset(srl->buf, 0, srl->bufSize);
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srl->bufLim = srl->buf + srl->bufSizeMax;
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/* This line sets the buffer pointer
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* so that the first thing to do is reset and fill the buffer
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* using real I/O.
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*/
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srl->bufPtr = srl->bufLim;
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} /* FlushSReadlineInfo */
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int
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InitSReadlineInfo(SReadlineInfo *srl, int fd, char *buf, size_t bsize, int tlen, int requireEOLN)
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{
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if (buf == NULL) {
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if (bsize < 512)
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bsize = 512; /* Pointless, otherwise. */
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buf = (char *) malloc(bsize);
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if (buf == NULL)
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return (-1);
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srl->malloc = 1;
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} else {
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srl->malloc = 0;
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}
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memset(buf, 0, bsize);
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srl->buf = buf;
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srl->bufSize = bsize;
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srl->bufSizeMax = bsize;
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srl->bufLim = srl->buf + bsize;
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srl->fd = fd;
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srl->timeoutLen = tlen;
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srl->requireEOLN = requireEOLN;
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/* This line sets the buffer pointer
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* so that the first thing to do is reset and fill the buffer
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* using real I/O.
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*/
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srl->bufPtr = srl->bufLim;
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return (0);
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} /* InitSReadlineInfo */
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void
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DisposeSReadlineInfo(SReadlineInfo *srl)
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{
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memset(srl->buf, 0, srl->bufSizeMax);
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if (srl->malloc != 0)
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free(srl->buf);
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memset(srl, 0, sizeof(SReadlineInfo));
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/* Note: it does not close(srl->fd). */
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} /* DisposeSReadlineInfo */
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/* Returns the number of bytes read, including the newline which is
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* also appended to the buffer. If you don't want that newline,
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* set buf[nread - 1] = '\0', if nread > 0.
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*/
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int
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SReadline(SReadlineInfo *srl, char *const linebuf, size_t linebufsize)
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{
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int err;
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char *src;
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char *dst;
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char *dstlim;
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int len;
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int nr;
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int requireEOLN;
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int illegals;
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illegals = 0;
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err = 0;
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dst = linebuf;
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dstlim = dst + linebufsize - 1; /* Leave room for NUL. */
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src = srl->bufPtr;
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requireEOLN = srl->requireEOLN;
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if (requireEOLN)
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dstlim--;
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if (dstlim <= dst)
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return (-1); /* Buffer too small. */
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forever {
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if ((requireEOLN == 0) && (dst >= dstlim))
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break;
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if (src >= srl->bufLim) {
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/* Fill the buffer. */
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if (illegals > 1) {
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/* Probable DOS -- return now and give you an
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* opportunity to handle bogus input.
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*/
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goto done;
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}
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nr = SRead(srl->fd, srl->buf, srl->bufSizeMax, srl->timeoutLen, 0);
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if (nr == 0) {
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/* EOF. */
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goto done;
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} else if (nr < 0) {
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/* Error. */
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err = nr;
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goto done;
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}
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srl->bufPtr = src = srl->buf;
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srl->bufLim = srl->buf + nr;
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}
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if (*src == '\0') {
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++src;
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illegals++;
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} else if (*src == '\r') {
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++src;
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/* If the next character is a \n that is valid,
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* otherwise treat a stray \r as an illegal character.
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*/
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if ((src < srl->bufLim) && (*src != '\n'))
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illegals++;
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} else {
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if (*src == '\n') {
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if (dst < dstlim)
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*dst++ = *src++;
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else
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src++;
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goto done;
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}
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if (dst < dstlim)
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*dst++ = *src++;
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else
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src++;
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}
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}
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done:
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srl->bufPtr = src;
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if ((requireEOLN != 0) && (dst != linebuf) && (dst[-1] != '\n'))
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*dst++ = '\n';
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if ((requireEOLN != 0) && (dst == linebuf) && (illegals > 0))
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*dst++ = '\n';
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*dst = '\0';
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len = (int) (dst - linebuf);
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if (err < 0)
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return (err);
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return (len);
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} /* SReadline */
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