STRING(3)

NAME
stpcpy, strcasecmp, strcat, strchr, strcmp, strcoll, strcpy, strcspn, strdup, strfry, strlen, strncat, strncmp, strncpy, strncasecmp, strpbrk, strrchr, strsep, strspn, strstr, strtok, strxfrm, index, rindex - string operations

SYNOPSIS
#include <strings.h>

int strcasecmp(const char *s1, const char *s2);
    Compare the strings s1 and s2 ignoring case.

int strncasecmp(const char *s1, const char *s2, size_t n);
    Compare the first n characters of the strings s1 and s2 ignoring case.

char *index(const char *s, int c);
    Return a pointer to the first occurrence of the character c in the string s.

char *rindex(const char *s, int c);
    Return a pointer to the last occurrence of the character c in the string s.

#include <string.h>

char *stpcpy(char *dest, const char *src);
    Copy a string from src to dest, returning a pointer to the end of the resulting string at dest.

char *strcat(char *dest, const char *src);
    Append the string src to the string dest, returning a pointer dest.

char *strchr(const char *s, int c);
    Return a pointer to the first occurrence of the character c in the string s.

int strcmp(const char *s1, const char *s2);
    Compare the strings s1 with s2.

int strcoll(const char *s1, const char *s2);
    Compare the strings s1 with s2 using the current locale.

char *strcpy(char *dest, const char *src);
    Copy the string src to dest, returning a pointer to the start of dest.

size_t strcspn(const char *s, const char *reject);
    Calculate the length of the initial segment of the string s which does not contain any of bytes in the string reject,

char *strdup(const char *s);
    Return a duplicate of the string s in memory allocated using malloc(3).

char *strfry(char *string);
    Randomly swap the characters in string.

size_t strlen(const char *s);
    Return the length of the string s.

char *strncat(char *dest, const char *src, size_t n);
    Append at most n characters from the string src to the string dest, returning a pointer to dest.

int strncmp(const char *s1, const char *s2, size_t n);
    Compare at most n bytes of the strings s1 and s2.

char *strncpy(char *dest, const char *src, size_t n);
    Copy at most n bytes from string src to dest, returning a pointer to the start of dest.

char *strpbrk(const char *s, const char *accept);
    Return a pointer to the first occurrence in the string s of one of the bytes in the string accept.

char *strrchr(const char *s, int c);
    Return a pointer to the last occurrence of the character c in the string s.

char *strsep(char **stringp, const char *delim);
    Extract the initial token in stringp that is delimited by one of the bytes in delim.

size_t strspn(const char *s, const char *accept);
    Calculate the length of the starting segment in the string s that consists entirely of bytes in accept.

char *strstr(const char *haystack, const char *needle);
    Find the first occurrence of the substring needle in the string haystack, returning a pointer to the found substring.

char *strtok(char *s, const char *delim);
    Extract tokens from the string s that are delimited by one of the bytes in delim.

size_t strxfrm(char *dest, const char *src, size_t n);
    Transforms src to the current locale and copies the first n characters to dest.

DESCRIPTION
The string functions perform operations on null-terminated strings. See the individual man pages for descriptions of each function.

SEE ALSO
index(3), rindex(3), stpcpy(3), strcasecmp(3), strcat(3), strchr(3), strcmp(3), strcoll(3), strcpy(3), strcspn(3), strdup(3), strfry(3), strlen(3), strncasecmp(3), strncat(3), strncmp(3), strncpy(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3), strxfrm(3)

COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.