FreeCalypso > hg > freecalypso-tools
annotate rvinterf/libprint/back_esc.c @ 926:6a0aa8d36d06
rvinterf backslash escape: introduce libprint
The new helper function library named libprint is meant to replace
the badly misnamed libg23, and will soon contain functions for
printing all of the same kinds of GPF TST packets that are now handled
in libg23. However, we are also moving safe_print_trace() from libasync
to this new library, and changing it to emit our new backslash escape
format.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 23 May 2023 03:47:46 +0000 |
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rvinterf backslash escape: introduce libprint
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1 /* |
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2 * The function implemented in this module prints a potentially-dirty string |
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3 * into a buffer with C-style backslash escapes, including doubling of any |
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4 * already-present backslashes. The output buffer must be sized for up to |
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5 * 4x expansion, plus the terminating NUL. |
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6 */ |
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7 |
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8 #include <sys/types.h> |
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9 #include <ctype.h> |
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10 #include <stdio.h> |
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11 |
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12 void |
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13 safe_print_trace(src, srclen, dest) |
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14 u_char *src; |
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15 char *dest; |
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16 { |
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17 int i, c; |
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18 char *dp; |
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19 |
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20 dp = dest; |
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21 for (i = 0; i < srclen; i++) { |
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22 c = src[i]; |
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23 switch (c) { |
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24 case '\\': |
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25 *dp++ = '\\'; |
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26 *dp++ = '\\'; |
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27 continue; |
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28 case '\r': |
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29 *dp++ = '\\'; |
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30 *dp++ = 'r'; |
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31 continue; |
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32 case '\n': |
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33 *dp++ = '\\'; |
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34 *dp++ = 'n'; |
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35 continue; |
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36 } |
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37 if (c >= ' ' && c <= '~') |
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38 *dp++ = c; |
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39 else if (c <= 7 && (i+1 == srclen || !isdigit(src[i+1]))) { |
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40 sprintf(dp, "\\%d", c); |
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41 dp += 2; |
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42 } else { |
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43 sprintf(dp, "\\x%02X", c); |
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44 dp += 4; |
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45 } |
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46 } |
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47 *dp = '\0'; |
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48 } |