215 lines
3.9 KiB
C
215 lines
3.9 KiB
C
/*
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* $Id: tio_get.c,v 1.8 2005/12/26 07:41:48 bacon Exp $
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*/
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#include <ase/cmn/tio.h>
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#include "mem.h"
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#define STATUS_GETC_EILSEQ (1 << 0)
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ase_ssize_t ase_tio_getc (ase_tio_t* tio, ase_char_t* c)
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{
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ase_size_t left = 0;
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ase_ssize_t n;
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ase_char_t curc;
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#ifndef ASE_CHAR_IS_MCHAR
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ase_size_t seqlen;
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#endif
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/* TODO: more efficient way to check this?
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* maybe better to use ASE_ASSERT
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* ASE_ASSERT (tio->input_func != ASE_NULL);
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*/
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if (tio->input_func == ASE_NULL)
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{
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tio->errnum = ASE_TIO_ENOINF;
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return -1;
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}
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if (tio->input_status & STATUS_GETC_EILSEQ)
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{
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tio->input_status &= ~STATUS_GETC_EILSEQ;
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tio->errnum = ASE_TIO_EILSEQ;
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return -1;
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}
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if (tio->inbuf_curp >= tio->inbuf_len)
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{
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getc_conv:
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n = tio->input_func (
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ASE_TIO_IO_DATA, tio->input_arg,
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&tio->inbuf[left], ASE_COUNTOF(tio->inbuf) - left);
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if (n == 0)
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{
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if (tio->inbuf_curp < tio->inbuf_len)
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{
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/* gargage left in the buffer */
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tio->errnum = ASE_TIO_EICSEQ;
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return -1;
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}
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return 0;
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}
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if (n <= -1)
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{
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tio->errnum = ASE_TIO_EINPUT;
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return -1;
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}
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tio->inbuf_curp = 0;
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tio->inbuf_len = (ase_size_t)n + left;
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}
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#ifdef ASE_CHAR_IS_MCHAR
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curc = tio->inbuf[tio->inbuf_curp++];
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#else
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left = tio->inbuf_len - tio->inbuf_curp;
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#if 0
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seqlen = ase_mblen (tio->inbuf[tio->inbuf_curp], left);
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if (seqlen == 0)
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{
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/* illegal sequence */
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tio->inbuf_curp++; /* skip one byte */
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tio->errnum = ASE_TIO_EILSEQ;
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return -1;
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}
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if (seqlen > left)
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{
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/* incomplete sequence */
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if (tio->inbuf_curp > 0)
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{
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ASE_MEMCPY (tio->inbuf, &tio->inbuf[tio->inbuf_curp], left);
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tio->inbuf_curp = 0;
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tio->inbuf_len = left;
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}
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goto getc_conv;
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}
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n = ase_mbtowc (&tio->inbuf[tio->inbuf_curp], seqlen, &curc);
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if (n == 0)
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{
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/* illegal sequence */
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tio->inbuf_curp++; /* skip one byte */
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tio->errnum = ASE_TIO_EILSEQ;
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return -1;
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}
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if (n > seqlen)
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{
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/* incomplete sequence -
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* this check might not be needed because ase_mblen has
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* checked it. would ASE_ASSERT (n <= seqlen) be enough? */
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if (tio->inbuf_curp > 0)
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{
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ASE_MEMCPY (tio->inbuf, &tio->inbuf[tio->inbuf_curp], left);
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tio->inbuf_curp = 0;
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tio->inbuf_len = left;
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}
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goto getc_conv;
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}
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#endif
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n = ase_mbtowc (&tio->inbuf[tio->inbuf_curp], left, &curc);
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if (n == 0)
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{
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/* illegal sequence */
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tio->inbuf_curp++; /* skip one byte */
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tio->errnum = ASE_TIO_EILSEQ;
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return -1;
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}
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if (n > left)
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{
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/* incomplete sequence */
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if (tio->inbuf_curp > 0)
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{
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ASE_MEMCPY (tio->inbuf, &tio->inbuf[tio->inbuf_curp], left);
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tio->inbuf_curp = 0;
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tio->inbuf_len = left;
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}
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goto getc_conv;
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}
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tio->inbuf_curp += n;
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#endif
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*c = curc;
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return 1;
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}
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ase_ssize_t ase_tio_gets (ase_tio_t* tio, ase_char_t* buf, ase_size_t size)
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{
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ase_ssize_t n;
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if (size <= 0) return 0;
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n = ase_tio_getsx (tio, buf, size - 1);
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if (n == -1) return -1;
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buf[n] = ASE_T('\0');
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return n;
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}
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ase_ssize_t ase_tio_getsx (ase_tio_t* tio, ase_char_t* buf, ase_size_t size)
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{
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ase_ssize_t n;
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ase_char_t* p, * end, c;
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if (size <= 0) return 0;
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p = buf; end = buf + size;
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while (p < end)
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{
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n = ase_tio_getc (tio, &c);
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if (n == -1)
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{
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if (p > buf && tio->errnum == ASE_TIO_EILSEQ)
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{
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tio->input_status |= STATUS_GETC_EILSEQ;
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break;
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}
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return -1;
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}
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if (n == 0) break;
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*p++ = c;
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/* TODO: support a different line breaker */
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if (c == ASE_T('\n')) break;
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}
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return p - buf;
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}
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ase_ssize_t ase_tio_getstr (ase_tio_t* tio, ase_str_t* buf)
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{
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ase_ssize_t n;
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ase_char_t c;
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ase_str_clear (buf);
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for (;;)
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{
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n = ase_tio_getc (tio, &c);
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if (n == -1)
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{
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if (ASE_STR_LEN(buf) > 0 && tio->errnum == ASE_TIO_EILSEQ)
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{
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tio->input_status |= STATUS_GETC_EILSEQ;
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break;
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}
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return -1;
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}
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if (n == 0) break;
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if (ase_str_ccat(buf, c) == (ase_size_t)-1)
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{
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tio->errnum = ASE_TIO_ENOMEM;
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return -1;
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}
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/* TODO: support a different line breaker */
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if (c == ASE_T('\n')) break;
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}
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return ASE_STR_LEN(buf);
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}
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