trimBlanks.c

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#include <genutils.h>
 
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
 
void trimBlanks(char* str) {
 
    // bail if the string is null
    if (str == NULL)
        return;
 
    // bail if empty string
    int i = strlen(str) - 1;
    if (i < 0)
        return;
 
    // find last non-blank char
    while (i >= 0) {
        if (isspace(str[i]))
            i--;
        else
            break;
    }
    int length = i + 1;
 
    // get rid of beginning spaces
    i = 0;
    while (i < length) {
        if (isspace(str[i]))
            i++;
        else
            break;
    }
 
    if (i > 0) {
        int j = 0;
        while (i < length) {
            str[j++] = str[i++];
        }
        // NULL terminate the string
        str[j] = 0;
 
    } else {
        // NULL terminate the string
        str[length] = 0;
    }
 
}
 
char* trimBlanksDup(const char* str) {
    // bail if the string is null
    if (str == NULL)
        return strdup("");
 
    // bail if empty string
    int i = strlen(str) - 1;
    if (i < 0)
        return strdup("");
 
    // find last non-blank char
    while (i >= 0) {
        if (isspace(str[i]))
            i--;
        else
            break;
    }
    int length = i + 1;
 
    // get rid of beginning spaces
    i = 0;
    while (i < length) {
        if (isspace(str[i]))
            i++;
        else
            break;
    }
 
    char* str2 = (char*) malloc(length - i + 1);
 
    int j = 0;
    while (i < length) {
        str2[j++] = str[i++];
    }
    // NULL terminate the string
    str2[j] = 0;
 
    return str2;
}