Added trim functions and tests

include/sv.h

@@ -2,17 +2,24 @@
 #define SV_INCLUDED
 
 #include <stddef.h>
-struct String_View{
+struct String_View {
     size_t len;
     const char *buf;
 };
 typedef struct String_View SV;
 
-// printf macros for String_View
+// Macros for String_View printf
 #define SV_FMT "%.*s"
 #define SV_ARG(sv) (int) (sv).len, (sv).buf
 
+// Null String
+#define SV_NULL sv_strn(NULL, 0)
+
 extern struct String_View sv_str(const char *s);
 extern struct String_View sv_strn(const char *s, size_t n);
+extern struct String_View sv_trim_left(struct String_View sv);
+extern struct String_View sv_trim_right(struct String_View sv);
+extern struct String_View sv_trim(struct String_View sv);
+
 
 #endif

src/sv.c

@@ -1,14 +1,36 @@
 #include "../include/sv.h"
 #include <string.h>
 
+#include <stdbool.h>
+
+static bool sv_is_space(int c) {
+    return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\v' || c == '\f';
+}
+//static int to_lower(char c) {
+  //return (c >= 'A' && c <= 'Z') ? c + 'a' - 'A' : c;
+//}
+
 struct String_View sv_str(const char *s) {
-  SV str = {s == NULL ? 0 : strlen(s), (char *) s };
+  struct String_View str = {s == NULL ? 0 : strlen(s), (char *) s };
   return str;
 }
-
 struct String_View sv_strn(const char *s, size_t n) {
-  SV str = {n, (char *) s};
+  struct String_View str = {n, (char *) s};
   return str;
 }
 
+struct String_View sv_trim(struct String_View s){
+    while (s.len > 0 && sv_is_space((int) *s.buf)) s.buf++, s.len--;
+    while (s.len > 0 && sv_is_space((int) *(s.buf + s.len - 1))) s.len--;
+    return s;
+}
+struct String_View sv_trim_left(struct String_View s){
+    while (s.len > 0 && sv_is_space((int) *s.buf)) s.buf++, s.len--;
+    return s;
+}
+struct String_View sv_trim_right(struct String_View s){
 
+    while (s.len > 0 && sv_is_space((int) *(s.buf + s.len - 1))) s.len--;
+
+    return s;
+}

tests/03_trim_left.c

@@ -0,0 +1,24 @@
+#define DEBUG
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include "../include/sv.h"
+
+int main(void){
+    const char *s = "   Hello World!";
+    const char *s2 = "Hello World!";
+    
+    SV sv = sv_str(s);
+    
+    assert(sv.buf != NULL);
+    assert(strlen(s) == sv.len);
+    assert( memcmp(sv.buf, s, strlen(s)) == 0);
+    SV sv2 = sv_trim_left(sv);
+    assert(sv2.len != strlen(s)); 
+    assert( memcmp(sv2.buf, s, sv2.len) != 0);
+    assert( memcmp(sv2.buf, s2, sv2.len) == 0);
+    assert( sv2.len == strlen(s2));
+    
+    return EXIT_SUCCESS;
+}

tests/04_trim_right.c

@@ -0,0 +1,21 @@
+#define DEBUG
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include "../include/sv.h"
+
+int main(void){
+    const char *s = "Hello World!   ";
+    const char *s2 = "Hello World!";
+    
+    SV sv = sv_str(s);
+    assert(sv.buf != NULL);
+    assert(strlen(s) == sv.len);
+    assert( memcmp(sv.buf, s, strlen(s)) == 0);
+    SV sv2 = sv_trim_right(sv);
+    assert(sv2.len == strlen(s2));
+    assert(memcmp(s2, sv2.buf, sv2.len) == 0);
+    assert(sv2.len != strlen(s));
+    return EXIT_SUCCESS;
+}

tests/05_trim.c

@@ -0,0 +1,22 @@
+#define DEBUG
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include "../include/sv.h"
+
+int main(void){
+    const char *s = "   Hello World!   ";
+    const char *s2 = "Hello World!";
+    
+    SV sv = sv_str(s);
+    assert(sv.buf != NULL);
+    assert(strlen(s) == sv.len);
+    assert( memcmp(sv.buf, s, strlen(s)) == 0);
+    SV sv2 = sv_trim(sv);
+    assert(sv2.len == strlen(s2));
+    assert(memcmp(s2, sv2.buf, sv2.len) == 0);
+    assert(sv2.len != strlen(s));
+    assert( memcmp(s, sv2.buf, sv2.len) != 0);
+    return EXIT_SUCCESS;
+}