FreeCalypso > hg > freecalypso-hwlab
diff simtool/hexstr.c @ 150:54e33e9238b6
fc-simtool: harmonize hex string code with fc-uicc-tool
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 07 Feb 2021 00:06:50 +0000 |
parents | |
children | d515cfbb3f39 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/simtool/hexstr.c Sun Feb 07 00:06:50 2021 +0000 @@ -0,0 +1,52 @@ +/* + * This module contains the function for decoding hex strings. + */ + +#include <sys/types.h> +#include <ctype.h> +#include <string.h> +#include <strings.h> +#include <stdio.h> +#include <stdlib.h> + +decode_hex_digit(c) +{ + if (c >= '0' && c <= '9') + return(c - '0'); + if (c >= 'A' && c <= 'F') + return(c - 'A' + 10); + if (c >= 'a' && c <= 'f') + return(c - 'a' + 10); + return(-1); +} + +decode_hex_data_from_string(arg, databuf, maxlen) + char *arg; + u_char *databuf; + unsigned maxlen; +{ + unsigned count; + + for (count = 0; ; count++) { + while (isspace(*arg)) + arg++; + if (!*arg) + break; + if (!isxdigit(arg[0]) || !isxdigit(arg[1])) { + fprintf(stderr, "error: invalid hex string input\n"); + return(-1); + } + if (count >= maxlen) { + fprintf(stderr, "error: hex input data is too long\n"); + return(-1); + } + databuf[count] = (decode_hex_digit(arg[0]) << 4) | + decode_hex_digit(arg[1]); + arg += 2; + } + if (!count) { + fprintf(stderr, "error: empty hex string argument\n"); + return(-1); + } + return(count); +}