FreeCalypso > hg > freecalypso-tools
view target-utils/libprintf/sprintf.c @ 965:2969032bdfac
fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing
The only 100% safe way to pass a NULL pointer as a function argument
in K&R C is to cast 0 to a pointer type; failing to do so may cause
mysterious bugs (invalid stack frames or garbage in argument registers)
on 64-bit machines. This issue has already been fixed in most of
FC host tools, but I just found some missed spots: passing of NULL UDH
to PDU encoding functions in fcup-smsend[mult] in the case of single
(not concatenated) SMS.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Fri, 01 Sep 2023 07:33:51 +0000 |
parents | e7502631a0f9 |
children |
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line source
#include <stdarg.h> extern void _sprintf_putchar(); int sprintf(char *strdest, char *fmt, ...) { va_list ap; char *strptr; int len; strptr = strdest; va_start(ap, fmt); len = _doprnt(fmt, ap, &_sprintf_putchar, &strptr); va_end(ap); *strptr = '\0'; return(len); }