welibc
A clear, secure, and well documented standard C library
strcpy.c
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2  Copyright (c) 2017 Walt Elam
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30 *******************************************************************************/
31 /***************************************************************************//**
32  @file strcpy.c
33 
34  @brief Defines the strcpy function
35 *******************************************************************************/
36 #include <string.h>
37 
38 /*******************************************************************************
39  strcpy
40 *//**
41  @brief Copies a string with null terminator from s2 into s1
42  @param *s1 The destination array
43  @param *s2 The source string
44 
45  The strcpy function copies the string pointed to by s2 (including the
46  terminating null character) into the array pointed to by s1.
47 
48  @note Copying between overlapping objects is supported, but the source may
49  be overwritten.
50 
51  @return The value of s1
52 *******************************************************************************/
53 char *
54 strcpy(char *s1, const char *s2)
55 {
56  size_t len = strlen(s2);
57 
58  if ( !s1 ||
59  !s2 ||
60  /* Check for wrapping while copying */
61  ((((unsigned long) -1) - ((unsigned long) s1)) < len) ||
62  ((((unsigned long) -1) - ((unsigned long) s2)) < len))
63  {
64  return s1;
65  }
66 
67  memmove(s1, s2, len);
68  s1[len] = '\0';
69 
70  return s1;
71 }
72 
strcpy
char * strcpy(char *s1, const char *s2)
Copies a string with null terminator from s2 into s1.
Definition: strcpy.c:54
strlen
size_t strlen(const char *s)
Computes the length of a string.
Definition: strlen.c:51
string.h
Declares types, functions, and macros for manipulating arrays of character type and other objects tre...
memmove
void * memmove(void *s1, const void *s2, size_t n)
Copies n characters from s2 into s1.
Definition: memmove.c:59
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