projects / thirdparty / man-pages.git / blame
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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| 2 | .\" | |
| 3 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 4 | .\" manual provided the copyright notice and this permission notice are | |
| 5 | .\" preserved on all copies. | |
| 6 | .\" | |
| 7 | .\" Permission is granted to copy and distribute modified versions of this | |
| 8 | .\" manual under the conditions for verbatim copying, provided that the | |
| 9 | .\" entire resulting derived work is distributed under the terms of a | |
| 10 | .\" permission notice identical to this one. | |
| c13182ef | 11 | .\" |
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12 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 13 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 14 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 15 | .\" the use of the information contained herein. The author(s) may not | |
| 16 | .\" have taken the same level of care in the production of this manual, | |
| 17 | .\" which is licensed free of charge, as they might when working | |
| 18 | .\" professionally. | |
| c13182ef | 19 | .\" |
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20 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 21 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 22 | .\" | |
| 23 | .\" References consulted: | |
| 24 | .\" Linux libc source code | |
| 25 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
| 26 | .\" 386BSD man pages | |
| 27 | .\" Modified Sat Jul 24 17:56:43 1993 by Rik Faith (faith@cs.unc.edu) | |
| 28 | .\" Added history, aeb, 980113. | |
| 7257eeb8 | 29 | .\" 2005-05-05 mtk: added strcasestr() |
| fea681da | 30 | .\" |
| 7257eeb8 | 31 | .TH STRSTR 3 2005-04-05 "GNU" "Linux Programmer's Manual" |
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32 | .SH NAME |
| 33 | strstr \- locate a substring | |
| 34 | .SH SYNOPSIS | |
| 35 | .nf | |
| 36 | .B #include <string.h> | |
| 37 | .sp | |
| 38 | .BI "char *strstr(const char *" haystack ", const char *" needle ); | |
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39 | .sp |
| 40 | .B #define _GNU_SOURCE | |
| 41 | .sp | |
| 42 | .B #include <string.h> | |
| 43 | .sp | |
| 44 | .BI "char *strcasestr(const char *" haystack ", const char *" needle ); | |
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45 | .fi |
| 46 | .SH DESCRIPTION | |
| 63aa9df0 | 47 | The \fBstrstr\fP() function finds the first occurrence of the substring |
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48 | \fIneedle\fP in the string \fIhaystack\fP. |
| 49 | The terminating \`\\0' characters are not compared. | |
| 7257eeb8 | 50 | |
| 63aa9df0 | 51 | The \fBstrcasestr\fP() function is like \fBstrstr\fP(), |
| 7257eeb8 | 52 | but ignores the case of both arguments. |
| fea681da | 53 | .SH "RETURN VALUE" |
| 7257eeb8 | 54 | These functions return a pointer to the beginning of the |
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55 | substring, or NULL if the substring is not found. |
| 56 | .SH BUGS | |
| 57 | Early versions of Linux libc (like 4.5.26) would not allow | |
| 63aa9df0 | 58 | an empty \fIneedle\fP argument for \fBstrstr\fP(). |
| 7257eeb8 | 59 | Later versions (like 4.6.27) work correctly, |
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60 | and return \fIhaystack\fP when \fIneedle\fP is empty. |
| 61 | .SH "CONFORMING TO" | |
| 68e1685c | 62 | The \fBstrstr\fP() function conforms to C89 and C99. |
| 63aa9df0 | 63 | The \fBstrcasestr\fP() function is a non-standard extension. |
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64 | .SH "SEE ALSO" |
| 65 | .BR index (3), | |
| 66 | .BR memchr (3), | |
| 67 | .BR rindex (3), | |
| 68 | .BR strchr (3), | |
| 7257eeb8 | 69 | .BR strcasecmp (3), |
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70 | .BR strpbrk (3), |
| 71 | .BR strsep (3), | |
| 72 | .BR strspn (3), | |
| 1709027c | 73 | .BR strtok (3), |
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74 | .BR wcsstr (3), |
| 75 | .BR feature_test_macros (7) |