براي پاك كردن يك كاركتر از يك رشته

[hamidli87]

سلام ببخشيد من رو كه قوانين رو بلد نبودم
من تو اون سوال با اينكه بخوام يك كاركتر رو از يك آرايه اي از كاركترها حذف كنم مشكل دارم يعني نمي دونم با چه دستوري اين كار رو مي كنند

[آرین]

کد:

با سلام
این سورس رو مشاهده کنید.


#include <stdio.h>
#include <string.h>                // strncpy
 
 
#define MAX_STRING 1024
#define STR1 "Thisx isx ax testx"
#define STR2 "Hello xWorld!"
 
 
void delete_at(char *src, int pos, int len);
void delete_char(char *src, char c, int len);
 
 
int
main(void)
{
        char buf1[MAX_STRING];
        char buf2[MAX_STRING];
 
        strncpy(buf1, STR1, sizeof(buf1));
        strncpy(buf2, STR2, sizeof(buf2));
 
        printf("\n");
 
        printf("Delete all 'x' characters from: [%s] -> ", buf1);
        delete_char(buf1, 'x', 0);
        printf("[%s]\n\n", buf1);
 
        printf("Delete the character at position 6 (zero offset) from: [%s] -> ", buf2);
        delete_at(buf2, 6, 0);
        printf("[%s]\n\n", buf2);
 
        return 0;
}
// main()
 
 
/**
* Delete a character from the specified position (zero offset)
*
* The len parameter allows the function to work with non null terminated
* strings and could also be considered a weak attempt at buffer overflow
* protection.
*
* @note The original string is modified.
*
* @param[in] src   Pointer to string from which to remove the character
* @param[in] pos   Zero-offset position of the character to remove
* @param[in] len   Max number of characters to process
*/
void
delete_at(char *src, int pos, int len)
{
        char *dst;
        int i;
 
        if ( pos < 0 )
                return;
 
        // Small attempt to control a buffer overflow if the
        // the string is not null-terminated and a proper length
        // is not specified.
        if ( len <= 0 )
                len = MAX_STRING;
 
        if ( pos >= len )
                return;
 
        src += pos;
        dst = src;
        src++;
 
        for ( i = pos + 1 ; i < len && *src != 0 ; i++ )
                *dst++ = *src++;
 
        // Ensure the string is null-terminated.
        *dst = 0;
 
        return;
}
// delete_at()
 
 
/**
* Delete all occurrences of a character from a string
*
* The len parameter allows the function to work with non null terminated
* strings and could also be considered a weak attempt at buffer overflow
* protection.
*
* @note The original string is modified.
*
* @param[in] src   Pointer to string from which to remove characters
* @param[in] c     Character to remove
* @param[in] len   Max number of characters to process
*/
void
delete_char(char *src, char c, int len)
{
        char *dst;
        int i;
 
        // Do not remove NULL characters.
        if ( c == 0 )
                return;
 
        // Small attempt to control a buffer overflow if the
        // the string is not null-terminated and a proper length
        // is not specified.
        if ( len <= 0 )
                len = MAX_STRING;
 
        dst = src;
 
        for ( i = 0 ; i < len && *src != 0 ; i++, src++ )
        {
                if ( *src != c )
                        *dst++ = *src;
        }
 
        // Ensure the string is null-terminated.
        *dst = 0;
 
        return;
}
// delete_char()