water-air-flash · September 23, 2016 08:31 · May 4, 2014 · May 2, 2014 · Apr 29, 2014
diff --git a/string.c b/string.c
@@ -44,7 +44,7 @@ void str_shrink(string *s) {
     s->str[s->size-1] = '\0';
 }
 
-unsigned int str_size(string *s) {
+unsigned int str_sizeof(string *s) {
     return s->size;
 }
 

diff --git a/string.h b/string.h
@@ -18,7 +18,7 @@ void str_grow(string *s);
 void str_growto(string *s, unsigned int newsize);
 void str_shrink(string *s);
 
-unsigned int str_size(string *s);
+unsigned int str_sizeof(string *s);
 unsigned int str_length(string *s);
 
 void str_append(string *s, char *app);

diff --git a/string.c b/string.c
@@ -25,7 +25,9 @@ void str_growto(string *s, unsigned int newsize) {
 
     unsigned int oldsize = s->size;
 
-    s->size = newsize;
+    while(s->size < newsize)
+        s->size *= 2;
+
     s->str = (char *)realloc((void *)s->str, s->size);
 
     memset((void *)(s->str + oldsize), '\0', s->size - oldsize);

diff --git a/main.c b/main.c
@@ -0,0 +1,32 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include "string.h"
+
+string *readline() {
+    string *buf = str_create("");
+    int c;
+
+    for(c = getchar(); c != EOF && c != '\n'; c = getchar()) {
+        str_cappend(buf, c);
+    }
+
+    return buf;
+}
+
+int main() {
+    string *mystring = readline();
+
+    // example std input: "this is an example"
+
+    printf("%s\n", str_get(mystring)); // prints: this is an example
+    printf("%d\n", str_length(mystring)); // prints: 18
+    printf("%c\n", str_getc(mystring, 5)); // prints: 'i'
+
+    strncpy(mystring->str, "here", strlen("here"));
+
+    printf("%s\n", str_get(mystring)); // prints: here is an example
+
+    str_free(mystring);
+
+    return 0;
+}
diff --git a/string.c b/string.c
@@ -0,0 +1,86 @@
+#include "string.h"
+
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+
+string *str_create(char *init) {
+    string *s = (string *)malloc(sizeof(string));
+
+    if(!s) return NULL;
+
+    s->size = MAX(strlen(init) + 1, STRSIZE);
+    s->str = (char *)malloc(s->size);
+
+    strcpy(s->str, init);
+
+    return s;
+}
+
+void str_free(string *s) {
+    free(s->str);
+    free(s);
+}
+
+void str_growto(string *s, unsigned int newsize) {
+    if(newsize <= s->size) return;
+
+    unsigned int oldsize = s->size;
+
+    s->size = newsize;
+    s->str = (char *)realloc((void *)s->str, s->size);
+
+    memset((void *)(s->str + oldsize), '\0', s->size - oldsize);
+}
+
+void str_grow(string *s) {
+    str_growto(s, s->size * 2);
+}
+
+void str_shrink(string *s) {
+    s->size /= 2;
+    s->size = MAX(s->size, STRSIZE);
+    s->str = (char *)realloc((void *)s->str, s->size);
+    s->str[s->size-1] = '\0';
+}
+
+unsigned int str_size(string *s) {
+    return s->size;
+}
+
+unsigned int str_length(string *s) {
+    return strlen(s->str);
+}
+
+char str_getc(string *s, unsigned int index) {
+    if(index >= s->size) return '\0';
+
+    return s->str[index];
+}
+
+char *str_get(string *s) {
+    return s->str;
+}
+
+void str_append(string *s, char *app) {
+    int len = strlen(s->str);
+
+    str_growto(s, s->size + len);
+
+    int i;
+    for(i = 0; i < strlen(app); i++) {
+        s->str[len+i] = app[i];
+    }
+}
+
+void str_cappend(string *s, char c) {
+    unsigned int len = strlen(s->str);
+
+    if(len >= s->size-1)
+        str_grow(s);
+
+    s->str[len] = c;
+}
+
+void str_set(string *s, char *newstr) {
+    str_growto(s, s->size + strlen(newstr));
+    strcpy(s->str, newstr);
+}
diff --git a/string.h b/string.h
@@ -0,0 +1,32 @@
+#ifndef STRING_H
+#define STRING_H
+
+#include <stdlib.h>
+#include <string.h>
+
+#define STRSIZE 10
+
+typedef struct {
+    char *str;
+    unsigned int size;
+} string;
+
+string *str_create(char *init);
+void str_free(string *s);
+
+void str_grow(string *s);
+void str_growto(string *s, unsigned int newsize);
+void str_shrink(string *s);
+
+unsigned int str_size(string *s);
+unsigned int str_length(string *s);
+
+void str_append(string *s, char *app);
+void str_cappend(string *s, char c);
+
+char str_getc(string *s, unsigned int index);
+char *str_get(string *s);
+
+void str_set(string *s, char *newstr);
+
+#endif
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