FreeCalypso > hg > freecalypso-tools
view uptools/libcoding/utf8_decode2.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 | 83c755829e31 |
children | 6bf473f77fc4 |
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/* * This library module implements the function for converting UTF-8 input * to UCS-2 in outgoing SMS composition. */ #include <sys/types.h> utf8_to_ucs2(inbuf, outbuf, outmax, outlenp) u_char *inbuf; u_short *outbuf; unsigned outmax, *outlenp; { u_char *ip = inbuf; u_short *op = outbuf; unsigned outcnt = 0, c, n, uni; while (c = *ip++) { if (c < 0x80) { uni = c; goto gotuni; } if (c < 0xC0 || c > 0xEF) return(-1); uni = c & 0x1F; if (c >= 0xE0) n = 2; else n = 1; for (; n; n--) { c = *ip++; if (c < 0x80 || c > 0xBF) return(-1); uni <<= 6; uni |= c & 0x3F; } gotuni: if (outcnt >= outmax) return(-2); *op++ = uni; outcnt++; } *outlenp = outcnt; return(0); }