add focused unit and map checks

tests/str_test.c

@@ -0,0 +1,84 @@
+#include "test.h"
+
+void
+str_init_utf8(struct ct *t)
+{
+	char full[Maxrunes+2];
+	char incomplete[] = { (char)0xea, (char)0xb0 };
+	Str s;
+
+	s = mkstr("A한😀");
+	CT_EQ_INT(t, 3, s.n);
+	checkstr(t, "round trip", "A한😀", &s);
+	sinit(&s, incomplete, sizeof incomplete);
+	CT_EQ_INT(t, 0, s.n);
+	memset(full, 'a', sizeof full);
+	full[sizeof full-1] = '\0';
+	sinit(&s, full, strlen(full));
+	CT_EQ_INT(t, Maxrunes, s.n);
+}
+
+void
+str_edit_and_alias(struct ct *t)
+{
+	Str s;
+	int i;
+
+	s = mkstr("ab");
+	sappend(&s, &s);
+	checkstr(t, "self append", "abab", &s);
+	for(i = 0; i < 40; i++)
+		s.r[i] = 'a' + i % 26;
+	s.n = 40;
+	sappend(&s, &s);
+	CT_EQ_INT(t, Maxrunes, s.n);
+	for(i = 0; i < 24; i++)
+		if(s.r[40+i] != s.r[i])
+			CT_ERRORF(t, "capped self append differs at rune %d", i);
+}
+
+void
+str_utf8_capacity(struct ct *t)
+{
+	static const struct {
+		int size;
+		int n;
+		char *want;
+	} cases[] = {
+		{ 0, 0, nil },
+		{ 1, 0, "" },
+		{ 2, 1, "a" },
+		{ 3, 1, "a" },
+		{ 4, 1, "a" },
+		{ 5, 4, "a한" },
+		{ 6, 5, "a한b" },
+	};
+	char buf[16];
+	Str s;
+	int i, n;
+
+	s = mkstr("a한b");
+	for(i = 0; i < nelem(cases); i++){
+		memset(buf, 'Z', sizeof buf);
+		n = stoutf(&s, buf, cases[i].size);
+		if(n != cases[i].n)
+			CT_ERRORF(t, "size %d: want length %d, got %d",
+				cases[i].size, cases[i].n, n);
+		if(cases[i].size == 0){
+			CT_EQ_INT(t, 'Z', buf[0]);
+			continue;
+		}
+		if(strcmp(cases[i].want, buf) != 0)
+			CT_ERRORF(t, "size %d: want \"%s\", got \"%s\"",
+				cases[i].size, cases[i].want, buf);
+		CT_EQ_INT(t, 'Z', buf[cases[i].size]);
+	}
+
+	s = mkstr("😀");
+	memset(buf, 'Z', sizeof buf);
+	CT_EQ_INT(t, 0, stoutf(&s, buf, 4));
+	CT_EQ_STR(t, "", buf);
+	CT_EQ_INT(t, 4, stoutf(&s, buf, 5));
+	CT_EQ_STR(t, "😀", buf);
+	CT_EQ_INT(t, 'Z', buf[5]);
+}