string (3) - Linux Manuals

string: string operations

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 bytes 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 bytes 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 bytes to dest.

DESCRIPTION

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

COLOPHON

This page is part of release 5.10 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/.