.

bac2/os/chap2/ex2.c

@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char* expand_tabs(const char* string);
+
+int main(void)
+{
+	const char* str = "This is a text	This is another one. ' ' <- space; '	' <-tab";
+	printf("%s - %d\n", str, (int)strlen(str));
+	printf("%s - %d\n", expand_tabs(str),(int) strlen(expand_tabs(str)));
+	
+}
+
+char* expand_tabs(const char* string){
+	int tab_count = 0, letter_count = 0;
+	for(int i = 0; string[i] != '\0'; i++){
+		letter_count++;
+		if(string[i] == '\t')
+			tab_count++;
+	}
+	char* ret = malloc(sizeof(char) * letter_count + 3*tab_count);
+	char* filler = ret;
+	for(int i = 0; string[i] != '\0'; i++){
+		if(string[i] == '\t'){
+			for (int j = 0; j < 4; ++j) {
+				*(filler++) = ' ';
+			}
+		}else{
+			*(filler++) = string[i];
+		}
+	}
+	return ret;
+}