FreeCalypso > hg > freecalypso-tools
view uptools/libcoding/gsm7_encode.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 | 061f8d75083d |
children | ec7e23d5151f |
line wrap: on
line source
/* * This library module implements the function for encoding from ISO 8859-1 * into the GSM 7-bit default alphabet (03.38 or 23.038). */ #include <sys/types.h> extern u_char gsm7_encode_table[256]; latin1_to_gsm7(inbuf, outbuf, outmax, outlenp) u_char *inbuf, *outbuf; unsigned outmax, *outlenp; { u_char *ip = inbuf, *op = outbuf; unsigned outcnt = 0, c, n; while (c = *ip++) { c = gsm7_encode_table[c]; if (c == 0xFF) return(-1); if (c & 0x80) n = 2; else n = 1; if (outcnt + n > outmax) return(-2); if (c & 0x80) { *op++ = 0x1B; *op++ = c & 0x7F; } else *op++ = c; outcnt += n; } *outlenp = outcnt; return(0); }