1 /****************************************************************************
2 * Copyright (c) 1998-2003,2004 Free Software Foundation, Inc. *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
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8 * distribute, distribute with modifications, sublicense, and/or sell *
9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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23 * Except as contained in this notice, the name(s) of the above copyright *
24 * holders shall not be used in advertising or otherwise to promote the *
25 * sale, use or other dealings in this Software without prior written *
27 ****************************************************************************/
29 /****************************************************************************
30 * State-machine fallback written by Thomas E. Dickey 2002 *
31 ****************************************************************************/
34 * This function is needed to support vwscanw
37 #include <curses.priv.h>
41 MODULE_ID("$Id: vsscanf.c,v 1.18 2004/04/03 20:27:02 tom Exp $")
43 #if !(HAVE_VFSCANF || HAVE__DOSCAN)
52 ,cError /* anything that isn't ANSI */
73 ,sPercent /* last was '%' beginning a format */
74 ,sNormal /* ...somewhere in the middle */
75 ,sLeft /* last was left square bracket beginning a range */
76 ,sRange /* ...somewhere in the middle */
77 ,sFinal /* last finished a format */
81 final_ch(int ch, OtherType other)
83 ChunkType result = cUnknown;
87 if (other == oUnknown)
125 if (other == oUnknown)
131 if (other == oUnknown)
137 if (other == oUnknown)
149 OtherType result = oUnknown;
164 vsscanf(const char *str, const char *format, va_list ap)
166 #if HAVE_VFSCANF || HAVE__DOSCAN
168 * This code should work on anything descended from AT&T SVr1.
172 strbuf._flag = _IOREAD;
173 strbuf._ptr = strbuf._base = (unsigned char *) str;
174 strbuf._cnt = strlen(str);
175 strbuf._file = _NFILE;
178 return (vfscanf(&strbuf, format, ap));
180 return (_doscan(&strbuf, format, ap));
183 static int can_convert = -1;
188 T((T_CALLED("vsscanf(%s,%s,...)"),
190 _nc_visbuf2(2, format)));
193 * This relies on having a working "%n" format conversion. Check if it
194 * works. Only very old C libraries do not support it.
196 * FIXME: move this check into the configure script.
198 if (can_convert < 0) {
201 if (sscanf("123", "%d%n", &check1, &check2) > 0
211 size_t len_fmt = strlen(format) + 32;
212 char *my_fmt = malloc(len_fmt);
213 ChunkType chunk, ctest;
214 OtherType other, otest;
222 * Split the original format into chunks, adding a "%n" to the end
223 * of each (except of course if it used %n), and use that
224 * information to decide where to start scanning the next chunk.
226 * FIXME: does %n count bytes or characters? If the latter, this
227 * will require further work for multibyte strings.
229 while (*format != '\0') {
235 for (n = 0; format[n] != 0 && state != sFinal; ++n) {
236 my_fmt[n] = format[n];
239 if (format[n] == '%')
243 if (format[n] == '%') {
245 } else if (format[n] == L_SQUARE) {
254 if (format[n] == '^') {
256 my_fmt[n] = format[n];
260 if (format[n] == R_SQUARE) {
266 if (format[n] == '*') {
269 if ((ctest = final_ch(format[n], other)) != cUnknown) {
272 } else if ((otest = other_ch(format[n])) != oUnknown) {
274 } else if (isalpha(UChar(format[n]))) {
287 if (chunk == cUnknown
288 || chunk == cError) {
294 /* add %n, if the format was not that */
295 if (chunk != cAssigned) {
296 strcat(my_fmt, "%n");
301 strcat(my_fmt, "%n");
305 pointer = va_arg(ap, int *);
308 pointer = va_arg(ap, short *);
311 pointer = va_arg(ap, float *);
314 pointer = va_arg(ap, double *);
317 pointer = va_arg(ap, long *);
320 pointer = va_arg(ap, void *);
325 pointer = va_arg(ap, char *);
331 /* do the conversion */
332 T(("...converting chunk #%d type %d(%s,%s)",
334 _nc_visbuf2(1, str + consumed),
335 _nc_visbuf2(2, my_fmt)));
336 if (sscanf(str + consumed, my_fmt, pointer, &eaten) > 0)
345 returnCode(assigned);
351 _nc_vsscanf(void); /* quiet's gcc warning */
355 } /* nonempty for strict ANSI compilers */
356 #endif /* !HAVE_VSSCANF */