CrossWorks for ARM User Guide

strerrorSynopsisDescriptionPortability#include char *strerror(int errnum);strerror maps the number in errnum to a message string. Typically, the values forerrnum come from errno, but strerror can map any value of type int to a message.strerror returns a pointer to the message string.The program must not modify the returned message string. The message may beoverwritten by a subsequent call to strerror.strerror conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).strlenSynopsisDescriptionPortability#include size_t strlen(const char *s);strlen returns the length of the string pointed to by s, that is the number of charactersthat precede the terminating null character.strlen conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).strncatSynopsisDescriptionPortability#include char *strncat(char *s1, const char *s2, size_t n);strncat appends not more than n characters from the array pointed to by s2 to the endof the string pointed to by s1. A null character in s1 and characters that follow it are notappended. The initial character of s2 overwrites the null character at the end of s1. Aterminating null character is always appended to the result. The behaviour of strncatis undefined if copying takes place between objects that overlap.strncat returns the value of s1.strncat conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).strncmpSynopsisDescription#include int strncmp(const char *s1, const char *s2, size_t n);strncmp compares not more than n characters from the array pointed to by s1 to thearray pointed to by s2. Characters that follow a null character are not compared.Chapter 28 - String handling315