FreeCalypso > hg > freecalypso-tools
view uptools/libcoding/hexdecode.c @ 580:ca28592b0b34
top Makefile: rvinterf is about to start using libpwon
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 02 Feb 2020 22:04:12 +0000 |
parents | 18c692984549 |
children |
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/* * This library module implements decoding of long hex strings, * such as SMS PDUs. */ #include <sys/types.h> #include <ctype.h> decode_hex_line(inbuf, outbuf, outmax) char *inbuf; u_char *outbuf; unsigned outmax; { char *inp = inbuf; u_char *outp = outbuf; unsigned outcnt = 0; int c, d[2], i; while (*inp) { if (!isxdigit(inp[0]) || !isxdigit(inp[1])) return(-1); if (outcnt >= outmax) break; for (i = 0; i < 2; i++) { c = *inp++; if (isdigit(c)) d[i] = c - '0'; else if (isupper(c)) d[i] = c - 'A' + 10; else d[i] = c - 'a' + 10; } *outp++ = (d[0] << 4) | d[1]; outcnt++; } return outcnt; }