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annotate anagram/support/port.cpp @ 21:1c9dac05d040

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Add lint-style FALLTHROUGH annotations to fallthrough cases. (in the parse engine and thus the output code) Document this, because the old output causes warnings with gcc10.
author David A. Holland
date Mon, 13 Jun 2022 00:04:38 -0400
parents 13d2b8934445
children
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1 /*
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2 * AnaGram, A System for Syntax Directed Programming
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3 * Copyright 2006 David A. Holland. All rights reserved.
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4 * See the file COPYING for license and usage terms.
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5 *
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6 * port.cpp - portability file
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7 */
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8
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9 #include <ctype.h>
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10 #include <stdio.h>
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11 #include <stdarg.h>
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12 #include "port.h"
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13
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14 #include "assert.h"
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15
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16 ////////////////////////////////////////////////////////////
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17 //
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18 // OS issues
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19 //
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20
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21 #ifdef AG_ON_UNIX
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22
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23 /*
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24 * This function is standard in most/all DOS compilers and C libraries;
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25 * I think it originated in Turbo C.
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26 */
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27 char *strlwr(char *string) {
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28 for (char *s = string; *s; s++) {
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29 *s = tolower((unsigned char) *s);
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30 }
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31 return string;
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32 }
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33
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34 #endif
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35
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36 ////////////////////////////////////////////////////////////
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37 //
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38 // Compiler issues
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39 //
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40
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41 #ifdef __IBMCPP__
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42
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43 /*
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44 * Obsolete compiler, no snprintf.
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45 *
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46 * Ignoring the maximum length is less than desirable but will have to
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47 * do. This is being used to replace unchecked sprintfs anyway.
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48 */
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49 int snprintf(char *buf, unsigned maxlen, const char *fmt, ...) {
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50 va_list ap;
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51 int ret;
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52
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53 va_start(ap, fmt);
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54 ret = vsprintf(buf, fmt, ap);
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55 va_end(ap);
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56
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57 /* prevent catastrophe, hopefully */
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58 assert(ret < 0 || (unsigned)ret < maxlen);
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59
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60 return ret;
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61 }
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62
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63 #endif /* __IBMCPP__ */
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64