FreeCalypso > hg > freecalypso-tools
view target-utils/simagent/stringarg.c @ 860:7d4f080f66db
fc-add-ramps: actually produce correct output
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 18 Dec 2021 21:17:33 +0000 |
parents | 0cffc53991f9 |
children |
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/* * This module contains the function that parses our hex string arguments. */ #include <ctype.h> #include "types.h" static decode_hex_digit(c) { if (isdigit(c)) return c - '0'; else if (islower(c)) return c - 'a' + 10; else return c - 'A' + 10; } decode_hex_string_arg(arg, buf, maxlen) char *arg; u8 *buf; unsigned maxlen; { unsigned count; for (count = 0; ; ) { while (isspace(*arg)) arg++; if (!*arg) break; if (!isxdigit(arg[0]) || !isxdigit(arg[1])) { printf("ERROR: invalid hex string input\n"); return(-1); } if (count >= maxlen) { printf("ERROR: hex string input is too long\n"); return(-1); } buf[count++] = (decode_hex_digit(arg[0]) << 4) | decode_hex_digit(arg[1]); arg += 2; } return count; }