FreeCalypso > hg > freecalypso-hwlab
view uicc/hexstr.c @ 145:14dee03e9675
fc-uicc-tool: low-level write commands ported over
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 06 Feb 2021 02:17:51 +0000 |
parents | baf5bd698764 |
children | 65a2a96386cd |
line wrap: on
line source
/* * 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); }