FreeCalypso > hg > freecalypso-tools

annotate uptools/libcoding/gsm7_encode.c @ 965:2969032bdfac

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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
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dbeb4a5628f5 uptools/libcoding: implemented 8859-1 -> GSM7 encoding function
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1 /*
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2 * This library module implements the function for encoding from ISO 8859-1
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3 * into the GSM 7-bit default alphabet (03.38 or 23.038).
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4 */
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5
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6 #include <sys/types.h>
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7
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8 extern u_char gsm7_encode_table[256];
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9
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10 latin1_to_gsm7(inbuf, outbuf, outmax, outlenp)
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11 u_char *inbuf, *outbuf;
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12 unsigned outmax, *outlenp;
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13 {
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14 u_char *ip = inbuf, *op = outbuf;
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15 unsigned outcnt = 0, c, n;
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16
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17 while (c = *ip++) {
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18 c = gsm7_encode_table[c];
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19 if (c == 0xFF)
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20 return(-1);
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21 if (c & 0x80)
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22 n = 2;
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23 else
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24 n = 1;
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25 if (outcnt + n > outmax)
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26 return(-2);
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27 if (c & 0x80) {
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28 *op++ = 0x1B;
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29 *op++ = c & 0x7F;
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30 } else
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31 *op++ = c;
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32 outcnt += n;
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33 }
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34 *outlenp = outcnt;
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35 return(0);
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36 }