projects / unix-history / blame
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1 | .\" Copyright (c) 1980 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| 038307dc | 5 | .\" @(#)string.3 6.5 (Berkeley) %G% |
| 2fe842cb | 6 | .\" |
| 8c41cf3b | 7 | .TH STRING 3 "" |
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8 | .UC 4 |
| 9 | .SH NAME | |
| d398dc0e | 10 | strcat, strncat, strcmp, strncmp, strcasecmp, strncasecmp, strcpy, |
| 28fe375c | 11 | strncpy, strlen, index, rindex \- string operations |
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12 | .SH SYNOPSIS |
| 13 | .nf | |
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14 | .B #include <strings.h> |
| 15 | .PP | |
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16 | .B char *strcat(s, append) |
| 17 | .B char *s, *append; | |
| 2fe842cb | 18 | .PP |
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19 | .B char *strncat(s, append, count) |
| 20 | .B char *s, *append; | |
| 21 | .B int count; | |
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22 | .PP |
| 23 | .B strcmp(s1, s2) | |
| 24 | .B char *s1, *s2; | |
| 25 | .PP | |
| 038307dc | 26 | .B strncmp(s1, s2, count) |
| 2fe842cb | 27 | .B char *s1, *s2; |
| 038307dc | 28 | .B int count; |
| 2fe842cb | 29 | .PP |
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30 | .B strcasecmp(s1, s2) |
| 31 | .B char *s1, *s2; | |
| 32 | .PP | |
| 038307dc | 33 | .B strncasecmp(s1, s2, count) |
| 28fe375c | 34 | .B char *s1, *s2; |
| 038307dc | 35 | .B int count; |
| 28fe375c | 36 | .PP |
| 038307dc KB |
37 | .B char *strcpy(to, from) |
| 38 | .B char *to, *from; | |
| 2fe842cb | 39 | .PP |
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40 | .B char *strncpy(to, from, count) |
| 41 | .B char *to, *from; | |
| 42 | .B int count; | |
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43 | .PP |
| 44 | .B strlen(s) | |
| 45 | .B char *s; | |
| 46 | .PP | |
| 47 | .B char *index(s, c) | |
| 48 | .B char *s, c; | |
| 49 | .PP | |
| 50 | .B char *rindex(s, c) | |
| 51 | .B char *s, c; | |
| 52 | .fi | |
| 53 | .SH DESCRIPTION | |
| 54 | These functions operate on null-terminated strings. | |
| 55 | They do not check for overflow of any receiving string. | |
| 56 | .PP | |
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57 | \fIStrcat\fP appends a copy of string \fIappend\fP to the end of string |
| 58 | \fIs\fP. \fIStrncat\fP copies at most \fIcount\fP characters. Both | |
| 59 | return a pointer to the null-terminated result. | |
| 60 | .PP | |
| 61 | \fIStrcmp\fP compares its arguments and returns an integer greater than, | |
| 62 | equal to, or less than 0, according as \fIs1\fP is lexicographically | |
| 63 | greater than, equal to, or less than \fIs2\fP. \fIStrncmp\fP makes the | |
| 64 | same comparison but looks at at most \fIcount\fP characters. | |
| 65 | \fIStrcasecmp\fP and \fIstrncasecmp\fP are identical in function, but are | |
| 66 | case insensitive. The returned lexicographic difference reflects a | |
| 67 | conversion to lower-case. | |
| 68 | .PP | |
| 69 | \fIStrcpy\fP copies string \fIfrom\fP to \fIto\fP, stopping after the | |
| 70 | null character has been moved. \fIStrncpy\fP copies exactly \fIcount\fP | |
| 71 | characters, appending nulls if \fIfrom\fP is less than \fIcount\fP | |
| 72 | characters in length; the target may not be null-terminated if the | |
| 73 | length of \fIfrom\fP is \fIcount\fP or more. Both return \fIto\fP. | |
| 74 | .PP | |
| 75 | \fIStrlen\fP returns the number of non-null characters in \fIs\fP. | |
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76 | .PP |
| 77 | .I Index | |
| 78 | .RI ( rindex ) | |
| a0ea9bf5 | 79 | returns a pointer to the first (last) occurrence of character |
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80 | \fIc\fP in string \fIs\fP or zero if \fIc\fP does not occur in |
| 81 | the string. Setting \fIc\fP to NULL works. |