FreeCalypso > hg > freecalypso-tools
annotate loadtools/hexdecode.c @ 924:d452188587b4
rvinterf: begin change to backslash escape output format
Right now throughout the rvinterf suite, any time we emit output that
is expected to be ASCII, but may contain non-printable garbage, we use
'cat -v' form of garbage character representation. Unfortunately, this
transformation is lossy (can't be reversed 100% reliably in the user's
wetware), hence we would like to migrate to C-style backslash escapes,
including doubling of any already-present backslashes - this escape
mechanism is lossless. Begin this change by converting the output
of RV and L1 traces in rvinterf and rvtdump.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 23 May 2023 03:10:50 +0000 |
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1 /* |
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2 * This module contains the decode_hex_byte() function, |
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3 * which is used by the SREC file reader and will likely be used |
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4 * by other code as well, such as the dump-to-file function |
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5 * of loadtool. |
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6 */ |
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7 |
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8 #include <ctype.h> |
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9 |
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10 decode_hex_byte(s) |
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11 char *s; |
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12 { |
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13 register int u, l; |
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14 |
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15 if (!isxdigit(s[0]) || !isxdigit(s[1])) |
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16 return(-1); |
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17 if (isdigit(s[0])) |
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18 u = s[0] - '0'; |
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19 else if (isupper(s[0])) |
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20 u = s[0] - 'A' + 10; |
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21 else |
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22 u = s[0] - 'a' + 10; |
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23 if (isdigit(s[1])) |
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24 l = s[1] - '0'; |
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25 else if (isupper(s[1])) |
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26 l = s[1] - 'A' + 10; |
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27 else |
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28 l = s[1] - 'a' + 10; |
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29 return((u << 4) | l); |
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30 } |