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1 /* |
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2 * Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * FUNCTION |
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16 * <<strcmp>>---character string compare |
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17 * INDEX |
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18 * strcmp |
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19 * ANSI_SYNOPSIS |
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20 * #include <string.h> |
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21 * int strcmp(const char *<[a]>, const char *<[b]>); |
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22 * TRAD_SYNOPSIS |
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23 * #include <string.h> |
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24 * int strcmp(<[a]>, <[b]>) |
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25 * char *<[a]>; |
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26 * char *<[b]>; |
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27 * <<strcmp>> compares the string at <[a]> to |
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28 * the string at <[b]>. |
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29 * RETURNS |
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30 * If <<*<[a]>>> sorts lexicographically after <<*<[b]>>>, |
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31 * <<strcmp>> returns a number greater than zero. If the two |
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32 * strings match, <<strcmp>> returns zero. If <<*<[a]>>> |
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33 * sorts lexicographically before <<*<[b]>>>, <<strcmp>> returns a |
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34 * number less than zero. |
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35 * PORTABILITY |
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36 * <<strcmp>> is ANSI C. |
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37 * <<strcmp>> requires no supporting OS subroutines. |
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38 * QUICKREF |
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39 * strcmp ansi pure |
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40 * |
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41 * |
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42 */ |
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43 |
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44 |
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45 |
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46 #include <string.h> |
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47 |
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48 /** |
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49 Compare two strings. |
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50 Compares string1 to s1 character by character. |
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51 This function starts comparing the first character of each string. |
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52 If they are equal to each other continues with the following pair |
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53 until the characters differ or until end of string is reached. |
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54 @return a value indicating the lexicographical relation between the strings |
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55 @param s1 Null-terminated string to compare. |
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56 @param s2 Null-terminated string to compare. |
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57 */ |
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58 EXPORT_C int |
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59 strcmp (const char *s1, const char *s2) |
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60 { |
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61 const unsigned char* p1=(const unsigned char*)s1; |
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62 const unsigned char* p2=(const unsigned char*)s2; |
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63 for (;;) |
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64 { |
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65 int c1=*p1++; |
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66 int d=c1-*p2++; |
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67 if (d!=0) |
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68 return d; |
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69 if (c1==0) |
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70 return d; |
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71 } |
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72 } |
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73 |
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74 /** |
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75 Compare the wide-character string pointed to by s1 to the wide-character |
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76 string pointed to by s2. |
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77 @return an integer greater than, equal to, or less than zero, if the |
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78 wide-character string pointed to by s1 is greater than, equal to, |
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79 or less than the wide-character string pointed to by s2. |
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80 */ |
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81 EXPORT_C int wcscmp (const wchar_t *s1, const wchar_t *s2) |
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82 { |
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83 for (;;) |
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84 { |
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85 int c1=*s1++; |
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86 int d=c1-*s2++; |
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87 if (d!=0) |
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88 return d; |
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89 if (c1==0) |
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90 return d; |
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91 } |
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92 } |