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gostring.c
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228 lines (218 loc) · 5.33 KB
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Only ASCII supported; bugs still exist on UTF-8
_Bool EqualFold(const char *s1, const char *s2)
{
int i = strlen(s1);
if (i != strlen(s2))
{
return 0;
}
else
{
while (i + 1)
{
if (s1[i] != s2[i])
{
if ((s1[i] >= 'A' && s1[i] <= 'Z' && s2[i] >= 'a' &&
s2[i] <= 'z' && s1[i] - s2[i] == 'A' - 'a'))
{
i--;
}
else if ((s2[i] >= 'A' && s2[i] <= 'Z' && s1[i] >= 'a' &&
s1[i] <= 'z' && s2[i] - s1[i] == 'A' - 'a'))
{
i--;
}
else
{
return 0;
}
}
else
{
i--;
}
}
}
return 1;
}
void testEqualFold()
{
printf("%s", EqualFold("AbcDefGhIjKl", "aBcdEfGhiJkl") ? "True" : "False");
}
int IndexByte(const char *s, char c)
{
int i = 0;
while (s[i] != c)
{
if (s[i] == '\0')
{
return -1;
}
else
{
i++;
}
}
return i;
}
void testIndexByte()
{
printf("%d\n", IndexByte("chicken", 'k'));
printf("%d\n", IndexByte("chicken", 'd'));
printf("%d\n", IndexByte("你好", '\xA0'));
}
int Index(const char *s, const char *sep)
{
char *i = strstr(s, sep);
if (i == NULL)
{
return -1;
}
else
{
return i - s;
}
}
void testIndex()
{
printf("%d\n", Index("RUNOOB", "NOOB"));
printf("%d\n", Index("你好", "\xA0"));
}
// Only ASCII supported; bugs still exist on UTF-8
#define HasPrefix(s, prefix) \
((_Bool)(strncmp((s), (prefix), strlen((prefix))) == 0))
void testHasPrefix()
{
printf("%s\n", HasPrefix("abcdefg", "abc") ? "True" : "False");
printf("%s\n", HasPrefix("abcdefg", "ac") ? "True" : "False");
printf("%s\n", HasPrefix("你好", "\xE4") ? "True" : "False");
}
// Only ASCII supported; bugs still exist on UTF-8
#define HasSuffix(s, prefix) \
((_Bool)(strcmp((s) + strlen((s)) - strlen((prefix)), (prefix)) == 0))
void testHasSuffix()
{
printf("%s\n", HasSuffix("abcdefg", "efg") ? "True" : "False");
printf("%s\n", HasSuffix("abcdefg", "eg") ? "True" : "False");
printf("%s\n", HasSuffix("你好", "\xBD") ? "True" : "False");
}
char *ToUpper(const char *str)
{
char *ret = (char *)malloc(sizeof(char) * (strlen(str) + 1));
int i;
if (ret == NULL)
{
return NULL;
}
else
{
for (i = 0; str[i] != '\0'; i++)
{
if (str[i] >= 'a' && str[i] <= 'z')
{
ret[i] = str[i] - 'a' + 'A';
}
else
{
ret[i] = str[i];
}
}
ret[i] = '\0';
return ret;
}
}
void testToUpper()
{
char array[] = "你好Go！\nHello,GO!";
char *tmp = ToUpper(array);
printf("ToUpper(%s)\n%s", array, tmp);
free(tmp);
}
char *ToLower(const char *str)
{
char *ret = (char *)malloc(sizeof(char) * (strlen(str) + 1));
int i;
if (ret == NULL)
{
return NULL;
}
else
{
for (i = 0; str[i] != '\0'; i++)
{
if (str[i] >= 'A' && str[i] <= 'Z')
{
ret[i] = str[i] - 'A' + 'a';
}
else
{
ret[i] = str[i];
}
}
ret[i] = '\0';
return ret;
}
}
void testToLower()
{
char array[] = "你好Go！\nHello,GO!";
char *tmp = ToLower(array);
printf("ToLower(%s)\n%s", array, tmp);
free(tmp);
}
int Count(const char *s, const char *sep)
{
if (sep[0] == '\0')
{
return strlen(s) + 1;
}
int count = 0;
while ((s = (strstr(s, sep))) != NULL)
{
s++;
count++;
}
return count;
}
void testCount()
{
char *s1 = "1145141919810";
char *s2 = "2";
char *s3 = "";
printf("Count(\"%s\",\"%s\")=%d\n", s1, s2, Count(s1, s2));
printf("Count(\"%s\",\"%s\")=%d\n", s1, s3, Count(s1, s3));
}
#define Contains(str, substr) ((_Bool)strstr((str), (substr)))
void testContains()
{
char s1[] = "I love Java Programming!";
char s2[] = "Programming";
char s3[] = "网络上学习Java";
char s4[] = "I love Java Programming!";
char s5[] = "I love Java programming!";
char s6[] = "Java";
char s7[] = "Java programming!";
printf("Contains(\"%s\",\"%s\")=%d\n", s1, s2, Contains(s1, s2));
printf("Contains(\"%s\",\"%s\")=%d\n", s1, s3, Contains(s1, s3));
printf("Contains(\"%s\",\"%s\")=%d\n", s1, s4, Contains(s1, s4));
printf("Contains(\"%s\",\"%s\")=%d\n", s1, s5, Contains(s1, s5));
printf("Contains(\"%s\",\"%s\")=%d\n", s1, s6, Contains(s1, s6));
printf("Contains(\"%s\",\"%s\")=%d\n", s1, s7, Contains(s1, s7));
printf("Contains(\"%s\",\"%s\")=%d\n", "", "", Contains("", ""));
printf("Contains(\"%s\",\"%s\")=%d\n", "1", "", Contains("1", ""));
}
int main()
{
// testEqualFold();
// testIndexByte();
// testIndex();
// testHasPrefix();
// testHasSuffix();
// testToUpper();
// testToLower();
// testCount();
// testContains();
}