Implementation of c string functions

Mar 29, 20160 likes4,078 views

This documents contains the implementation of the commonly used string library function found in C language

Prepared by
Mohammed Sikander
Technical Lead
Cranes Software International Limited

$ size_t strlen(const char *str); mohammed.sikander@cranessoftware.com 2 size_t mystrlen(const char *str) { const char *end = str; while( *end != ‘0’) end++; return end – str; }$

char * strcpy(char *dest, const char *src);
mohammed.sikander@cranessoftware.com 3
void mystrcpy(char *dest, const char *src)
{
while(1)
{
*dest = *src;
if(*dest == ‘0’)
return;
src++;
dest++;
}
}

char * strcpy(char *dest, const char *src);
mohammed.sikander@cranessoftware.com 4
void mystrcpy(char *dest, const char *src)
{
while((*dest++ = *src++))
{
}
}

$mohammed.sikander@cranessoftware.com 5 void mystrncpy(char *dest, const char *src, size_t n) { for(int i = 0 ; i < n ; i++) { *dest = *src; if(*dest == ‘0’) return; src++; dest++; } } int main( ) { char str[20] = “KARNATAKA”; char s1[20] = “ABCDEFGHIJKLMN”; char s2[20] = “ABCDEFGHIJKLMN”; mystrncpy(s1 , str ,5); mystrncpy(s2 , str , 12); printf(“s1 = %s n” , s1); printf(“s2 = %s n” , s2); }$

int strcmp(const char *str1 , const char *str2);
mohammed.sikander@cranessoftware.com 6
int mystrcmp(const char *str1 , const char *str2)
{
while(1)
{
if(*str1 != *str2)
return *str1 - *str2;
if(*str1 == ‘0’)
return 0;
str1++;
str2++;
}
}
while(*str1 == *str2 && *str1 != ‘0’)
{
str1++;
str2++;
}
return *str1 - *str2;

$int strncmp(const char *str1 , const char *str2,size_t n); mohammed.sikander@cranessoftware.com 7 int mystrcmp(const char *str1 , const char *str2,size_t n) { for(int I = 0 ; i < n ; i++) { if(*str1 != *str2) return *str1 - *str2; if(*str1 == ‘0’) return 0; str1++; str2++; } return 0; } int main( ) { char str1[ ] = “ BANGALORE”; char str2[ ] = “BANGKOK”; int res; res = mystrncmp(str1 , str2 , 3) ; printf(“res = %d “ , res); res = mystrncmp(str1 , str2 , 5) ; printf(“res = %d “ , res); }$

int strcmpi(const char *str1 , const char *str2);
mohammed.sikander@cranessoftware.com 8
int mystrcmpi(const char *str1 , const char *str2)
{
while(1)
{
char x = toupper(*str1);
char y = toupper(*str2);
if(x != y)
return x - y;
if(*str1 == ‘0’)
return 0;
str1++;
str2++;
}
}
int main( )
{
char str1 [ ] = “ BANGALORE “;
char str2 [ ] = “bangalore”;
int res;
res = mystrcmpi( str1 , str2);
printf(“res = %d “ , res);
}

void mystrrev(char *startptr)
{
int len = strlen(startptr);
char *endptr = startptr + len - 1;
while(startptr < endptr)
{
myswap(startptr , endptr);
startptr++;
endptr--;
}
}
mohammed.sikander@cranessoftware.com 9
void myswap(char *a,char *b)
{
char temp = *a;
*a = *b;
*b = temp;
}
int main( )
{
char str[ ] = “ SIKANDER”;
printf(“str = %s” , str);
mystrrev(str);
printf(“n After Reverse n”);
printf(“str = %s” , str);
}

char *strchr(const char *str, char key);
char *mystrchr(const char *str , char key)
{
while(*str != ‘0’)
{
if(*str == key)
return str;
str++;
}
return NULL;
}
mohammed.sikander@cranessoftware.com 10
int main( )
{
char str[ ] = “BANGALORE”;
char *ptr;
ptr = mystrchr(str , ‘A’);
if(ptr == NULL)
printf(“Key Not found”);
else
printf(“Found at index “ , ptr – str);
ptr = mystrchr(str , ‘C’);
if(ptr == NULL)
printf(“Key Not found”);
else
printf(“Found at index “ , ptr – str);
}

char *strrchr(const char *str, char key);
char *mystrrchr(const char *start , char key)
{
int len = strlen(str);
char *end = start + len – 1;
while(end > start)
{
if(*end == key)
return end;
end--;
}
return NULL;
}
mohammed.sikander@cranessoftware.com 11
int main( )
{
char str[ ] = “BANGALORE”;
char *ptr;
ptr = mystrrchr(str , ‘A’);
if(ptr == NULL)
printf(“Key Not found”);
else
printf(“Found at index “ , ptr – str);
ptr = mystrrchr(str , ‘C’);
if(ptr == NULL)
printf(“Key Not found”);
else
printf(“Found at index “ , ptr – str);
}

$char * mystrcat(char *dest , const char *src) { int len = strlen(dest); mystrcpy(dest + len , src); return dest; } mohammed.sikander@cranessoftware.com 12 char *mystrncat(char *dest , const char *src,size_t n) { int len = strlen(dest); mystrncpy(dest + len , src , n ); }$

char * mystrstr(char *str , char *key)
{
int len = strlen(key);
char *ptr;
while(1)
{
ptr = strchr(str , *key);
if(ptr == NULL)
return NULL;
int res = strncmp(ptr , key , len);
if(res != 0)
return ptr;
str = ptr + 1;
}
}
mohammed.sikander@cranessoftware.com 13
Main String :
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Sub String to Search :
GAL
GALA
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1. Prepared by Mohammed Sikander Technical Lead Cranes Software International Limited

2.  size_t strlen(const char *str); mohammed.sikander@cranessoftware.com 2 size_t mystrlen(const char *str) { const char *end = str; while( *end != ‘0’) end++; return end – str; }

3. char * strcpy(char *dest, const char *src); mohammed.sikander@cranessoftware.com 3 void mystrcpy(char *dest, const char *src) { while(1) { *dest = *src; if(*dest == ‘0’) return; src++; dest++; } }

4. char * strcpy(char *dest, const char *src); mohammed.sikander@cranessoftware.com 4 void mystrcpy(char *dest, const char *src) { while((*dest++ = *src++)) { } }

5. mohammed.sikander@cranessoftware.com 5 void mystrncpy(char *dest, const char *src, size_t n) { for(int i = 0 ; i < n ; i++) { *dest = *src; if(*dest == ‘0’) return; src++; dest++; } } int main( ) { char str[20] = “KARNATAKA”; char s1[20] = “ABCDEFGHIJKLMN”; char s2[20] = “ABCDEFGHIJKLMN”; mystrncpy(s1 , str ,5); mystrncpy(s2 , str , 12); printf(“s1 = %s n” , s1); printf(“s2 = %s n” , s2); }

6. int strcmp(const char *str1 , const char *str2); mohammed.sikander@cranessoftware.com 6 int mystrcmp(const char *str1 , const char *str2) { while(1) { if(*str1 != *str2) return *str1 - *str2; if(*str1 == ‘0’) return 0; str1++; str2++; } } while(*str1 == *str2 && *str1 != ‘0’) { str1++; str2++; } return *str1 - *str2;

7. int strncmp(const char *str1 , const char *str2,size_t n); mohammed.sikander@cranessoftware.com 7 int mystrcmp(const char *str1 , const char *str2,size_t n) { for(int I = 0 ; i < n ; i++) { if(*str1 != *str2) return *str1 - *str2; if(*str1 == ‘0’) return 0; str1++; str2++; } return 0; } int main( ) { char str1[ ] = “ BANGALORE”; char str2[ ] = “BANGKOK”; int res; res = mystrncmp(str1 , str2 , 3) ; printf(“res = %d “ , res); res = mystrncmp(str1 , str2 , 5) ; printf(“res = %d “ , res); }

8. int strcmpi(const char *str1 , const char *str2); mohammed.sikander@cranessoftware.com 8 int mystrcmpi(const char *str1 , const char *str2) { while(1) { char x = toupper(*str1); char y = toupper(*str2); if(x != y) return x - y; if(*str1 == ‘0’) return 0; str1++; str2++; } } int main( ) { char str1 [ ] = “ BANGALORE “; char str2 [ ] = “bangalore”; int res; res = mystrcmpi( str1 , str2); printf(“res = %d “ , res); }

9. void mystrrev(char *startptr) { int len = strlen(startptr); char *endptr = startptr + len - 1; while(startptr < endptr) { myswap(startptr , endptr); startptr++; endptr--; } } mohammed.sikander@cranessoftware.com 9 void myswap(char *a,char *b) { char temp = *a; *a = *b; *b = temp; } int main( ) { char str[ ] = “ SIKANDER”; printf(“str = %s” , str); mystrrev(str); printf(“n After Reverse n”); printf(“str = %s” , str); }

10. char *strchr(const char *str, char key); char *mystrchr(const char *str , char key) { while(*str != ‘0’) { if(*str == key) return str; str++; } return NULL; } mohammed.sikander@cranessoftware.com 10 int main( ) { char str[ ] = “BANGALORE”; char *ptr; ptr = mystrchr(str , ‘A’); if(ptr == NULL) printf(“Key Not found”); else printf(“Found at index “ , ptr – str); ptr = mystrchr(str , ‘C’); if(ptr == NULL) printf(“Key Not found”); else printf(“Found at index “ , ptr – str); }

11. char *strrchr(const char *str, char key); char *mystrrchr(const char *start , char key) { int len = strlen(str); char *end = start + len – 1; while(end > start) { if(*end == key) return end; end--; } return NULL; } mohammed.sikander@cranessoftware.com 11 int main( ) { char str[ ] = “BANGALORE”; char *ptr; ptr = mystrrchr(str , ‘A’); if(ptr == NULL) printf(“Key Not found”); else printf(“Found at index “ , ptr – str); ptr = mystrrchr(str , ‘C’); if(ptr == NULL) printf(“Key Not found”); else printf(“Found at index “ , ptr – str); }

12. char * mystrcat(char *dest , const char *src) { int len = strlen(dest); mystrcpy(dest + len , src); return dest; } mohammed.sikander@cranessoftware.com 12 char *mystrncat(char *dest , const char *src,size_t n) { int len = strlen(dest); mystrncpy(dest + len , src , n ); }

13. char * mystrstr(char *str , char *key) { int len = strlen(key); char *ptr; while(1) { ptr = strchr(str , *key); if(ptr == NULL) return NULL; int res = strncmp(ptr , key , len); if(res != 0) return ptr; str = ptr + 1; } } mohammed.sikander@cranessoftware.com 13 Main String : BANGALORE Sub String to Search : GAL GALA LOT

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