Hi!
I am trying to port some code from avr-gcc to SDCC to the mcs51
architecture.
Version:
d:\pjrc\nutbld\c>sdcc -v
SDCC : mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08
2.7.0 #4818 (May 31 2007) (MINGW32)
The stripped-down code is:
// code starts on NEXT line ----------------------
char *strtok_r(char *s, char *delim, char **last)
{
char *spanp;
int c, sc;
char *tok;
tok = s - 1;
/*
* Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
* Note that delim must have one NUL; we stop if we see that, too.
*/
for (;;) {
c = *s++;
spanp = (char *) delim;
do {
if ((sc = *spanp++) == c) {
if (c == 0)
s = /*NULL*/ 0;
else
*s[-1] = 0; // <- line 23
*last = s;
return (tok);
}
} while (sc != 0);
}
/* NOTREACHED */
}
// code ends here ------------
When compiling this code I receive:
d:\pjrc\nutbld\c>sdcc -c -mmcs51 --model-large -DPJRC_87C52
-D__HARVARD_ARCH__ -I../.././nutbld/include -I../.././nut/include
../.././nut/c/string/sigvtest.c -o string/sigvtest.o
../.././nut/c/string/sigvtest.c:23: error 27: Pointer required
Is this incorrect C code? After paging around in a C-textbook I found the
construct "*(s-1) = 0;" (Herbert Schild: teach yourself C, page 177) which I
tried. That one lead to:
d:\pjrc\nutbld\c>sdcc -c -mmcs51 --model-large -DPJRC_87C52
-D__HARVARD_ARCH__ -I../.././nutbld/include -I../.././nut/include
../.././nut/c/string/sigvtest.c -o string/sigvtest.o
../.././nut/c/string/sigvtest.c:23: warning 84: 'auto' variable '(null)' may
be
used before initialization
Caught signal 11: SIGSEGV
The SIGSEGV also occurs if I change the statement to " *s = 0;" (and I am
quite sure that is legal C ;-)
Interestingly, if I remove the "for (;;)" or the "do" statement and the
corresponding curly braces, the code compiles OK.
I also tried SDCC version 2008-01-25. All tests lead to the same result.
Am I doing something wrong here or did I run into a compiler problem?
Regards
Ernst
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