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