字符串反转与按词反转

#include <stdio.h>
#include <stdlib.h>


void revertWord(char * p, char* p1)
{
    char c;
    for (; p < p1; p++, p1--)
    {
        c = *p;
        *p = *p1;
        *p1 = c;
    }
}

void revert(char *p)
{
    char * p1;
    while (*p && *p == ' ')
        p++;
    if (!*p)
        return;
    p1 = p;
    while (*p && *p != ' ')
        p++;
    revertWord(p1, p - 1);
    revert(p);
}

void myrevert(char * word)
{
    if (!word)
        return;
    char * ptmp = word;
    int index = 0;
    while ( *(ptmp++) != '\0')
        index++;
    index--;
    for (int i = 0; i < index / 2; i++)
    {
        char c = ' ';
        c = *(word + i);
        *(word +i) = *(word + index - i);
        *(word + index - i) = c;
    }
}

void myrevertex(char * word, int index)
{
    if (!word)
        return;
    char * ptmp = word;
    index--;
    for (int i = 0; i < index / 2; i++)
    {
        char c = ' ';
        c = *(word + i);
        *(word + i) = *(word + index - i);
        *(word + index - i) = c;
    }
}

void mywordrevert(char * strdata)
{
    if (!strdata)
        return;

    int i = 0;
    char * pword = strdata;
    char * pleftdata = strdata;
    while ( *(pword) != '\0')
    {
        i++;
        if ( *pword == ' ')
        {
            myrevertex(pleftdata, i-1);
            pleftdata = pleftdata + i;
            pword = pleftdata;
            i = 0;
        }
        else
        {
            pword++;
        }
    }
    myrevertex(pleftdata, i);
}

void revert_word(char* pdatatop, char * pdataend)
{
    for (;pdatatop < pdataend; *pdatatop++, *pdataend--)
    {
        char temp = *pdataend;
        *pdataend = *pdatatop;
        *pdatatop = temp;
    }
}

void revert__(char * pdata)
{   
    while (*pdata && *pdata == ' ')
        pdata++;

    if (!*pdata)
        return;

    char * pbeforedata = pdata;
    while (*pdata && *pdata != ' ')
        pdata++;
    revert_word(pbeforedata, pdata-1);
    revert__(pdata);
}

int main()
{
    char line[] = "  abc   hello world ";
/*
    ///////字符串全反转
    myrevert(line);
    printf("%s \n", line);
*/

/*
    ///////字符串按词反转
    mywordrevert(line);
    printf("%s \n", line);
*/
    //revert(line);
    revert__(line);
    printf("%s \n", line);

    return 0;
}