1string.h(0P) POSIX Programmer's Manual string.h(0P)
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6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
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12 string.h — string operations
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15 #include <string.h>
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18 Some of the functionality described on this reference page extends the
19 ISO C standard. Applications shall define the appropriate feature test
20 macro (see the System Interfaces volume of POSIX.1‐2017, Section 2.2,
21 The Compilation Environment) to enable the visibility of these symbols
22 in this header.
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24 The <string.h> header shall define NULL and size_t as described in
25 <stddef.h>.
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27 The <string.h> header shall define the locale_t type as described in
28 <locale.h>.
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30 The following shall be declared as functions and may also be defined as
31 macros. Function prototypes shall be provided for use with ISO C stan‐
32 dard compilers.
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35 void *memccpy(void *restrict, const void *restrict, int, size_t);
36 void *memchr(const void *, int, size_t);
37 int memcmp(const void *, const void *, size_t);
38 void *memcpy(void *restrict, const void *restrict, size_t);
39 void *memmove(void *, const void *, size_t);
40 void *memset(void *, int, size_t);
41 char *stpcpy(char *restrict, const char *restrict);
42 char *stpncpy(char *restrict, const char *restrict, size_t);
43 char *strcat(char *restrict, const char *restrict);
44 char *strchr(const char *, int);
45 int strcmp(const char *, const char *);
46 int strcoll(const char *, const char *);
47 int strcoll_l(const char *, const char *, locale_t);
48 char *strcpy(char *restrict, const char *restrict);
49 size_t strcspn(const char *, const char *);
50 char *strdup(const char *);
51 char *strerror(int);
52 char *strerror_l(int, locale_t);
53 int strerror_r(int, char *, size_t);
54 size_t strlen(const char *);
55 char *strncat(char *restrict, const char *restrict, size_t);
56 int strncmp(const char *, const char *, size_t);
57 char *strncpy(char *restrict, const char *restrict, size_t);
58 char *strndup(const char *, size_t);
59 size_t strnlen(const char *, size_t);
60 char *strpbrk(const char *, const char *);
61 char *strrchr(const char *, int);
62 char *strsignal(int);
63 size_t strspn(const char *, const char *);
64 char *strstr(const char *, const char *);
65 char *strtok(char *restrict, const char *restrict);
66 char *strtok_r(char *restrict, const char *restrict, char **restrict);
67 size_t strxfrm(char *restrict, const char *restrict, size_t);
68 size_t strxfrm_l(char *restrict, const char *restrict,
69 size_t, locale_t);
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71 Inclusion of the <string.h> header may also make visible all symbols
72 from <stddef.h>.
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74 The following sections are informative.
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77 None.
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80 None.
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83 None.
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86 <locale.h>, <stddef.h>, <sys_types.h>
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88 The System Interfaces volume of POSIX.1‐2017, Section 2.2, The Compila‐
89 tion Environment, memccpy(), memchr(), memcmp(), memcpy(), memmove(),
90 memset(), strcat(), strchr(), strcmp(), strcoll(), strcpy(), strcspn(),
91 strdup(), strerror(), strlen(), strncat(), strncmp(), strncpy(), strp‐
92 brk(), strrchr(), strsignal(), strspn(), strstr(), strtok(), strxfrm()
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95 Portions of this text are reprinted and reproduced in electronic form
96 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
97 table Operating System Interface (POSIX), The Open Group Base Specifi‐
98 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
99 Electrical and Electronics Engineers, Inc and The Open Group. In the
100 event of any discrepancy between this version and the original IEEE and
101 The Open Group Standard, the original IEEE and The Open Group Standard
102 is the referee document. The original Standard can be obtained online
103 at http://www.opengroup.org/unix/online.html .
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105 Any typographical or formatting errors that appear in this page are
106 most likely to have been introduced during the conversion of the source
107 files to man page format. To report such errors, see https://www.ker‐
108 nel.org/doc/man-pages/reporting_bugs.html .
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112IEEE/The Open Group 2017 string.h(0P)