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annotate anagram/support/port.cpp @ 17:12171da8943f

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author David A. Holland
date Tue, 31 May 2022 01:56:37 -0400
parents 13d2b8934445
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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