strpbrk
- Locate characters in string,Returns a pointer to the first occurrence in str1 of any of the characters that are part of str2, or a null pointer if there are no matches.
- The search does not include the terminating null-characters of either strings, but ends there.
- 在 dest 所指向的空终止字节串中,扫描来自 breakset 所指向的空终止字节串的任何字符,并返回指向该字符的指针。
- 检索字符串 dest 中第一个匹配字符串 breakset 中字符的字符,不包含空结束字符。也就是说,依次检验字符串 dest 中的字符,当被检验字符在字符串 breakset 中也包含时,则停止检验,并返回该字符位置。
- 若 dest 或 breakset 不是指向空终止字节字符串的指针则行为未定义。
char* strpbrk( const char* dest, const char* breakset );
Parameters
dest
- C string to be scanned.
- 指向要分析的空终止字节字符串的指针
breakset
- C string containing the characters to match.
- 指向含要搜索的字符的空终止字节字符串的指针
Return Value
- A pointer to the first occurrence in str1 of any of the characters that are part of str2, or a null pointer if none of the characters of str2 is found in str1 before the terminating null-character.If none of the characters of str2 is present in str1, a null pointer is returned.
- 指向 dest 中首个亦在 breakset 中的字符的指针,或若这种字符不存在则为空指针。
- 该函数返回 dest 中第一个匹配字符串 breakset 中字符的字符数,如果未找到字符则返回 NULL。
名称代表“字符串指针打断 (string pointer break) ”,因为它返回指向首个分隔符(“打断”)的指针。
Example
//
// Created by zhangrongxiang on 2018/2/6 11:18
// File strpbrk
//
#include <stdio.h>
#include <string.h>
//依次检验字符串 str1 中的字符,当被检验字符在字符串 str2 中也包含时,则停止检验,并返回该字符位置。
//检索字符串 str1 中第一个匹配字符串 str2 中字符的字符,不包含空结束字符。
int main() {
int i = 0;
const char str1[] = "abcde2fghi3jk4l";
const char str2[] = "34";
const char *str3 = "Life is short,I use C";
char *ret;
ret = strpbrk(str1, str2);
if (ret) {
printf("Number one is : %c\n", *ret);//3
} else {
printf("No");
}
ret = strpbrk(str1, str3);
if (ret) {
printf("Number one is : %c\n", *ret);//e
} else {
printf("No");
}
printf("\n");
size_t len = strlen(str1);
char *ch = 0;
int index = 0;
char all[20] = {0};
//获取两个字符串的字符交集
for (; i < len; ++i) {
ret = strpbrk((str1 + sizeof(char) * (index + 1)), str3);
if (ret) {
ch = strrchr(str1, *ret);
index = (int) (ch - str1);
printf("Number one is : %c\n", *ret);
all[i] = *ret;
} else {
printf("No");
}
}
printf("\n");
for (i = 0; i < 20; ++i) {
if (all[i] == 0)
break;
printf("%c ", all[i]); //e f h i
}
printf("\n");
//单词统计
const char *str = "hello world, friend of mine!";
const char *sep = " ,!";
unsigned int cnt = 0;
do {
str = strpbrk(str, sep); // 寻找分隔符
// printf("%s\n",str);
if (str){
str += strspn(str, sep); // 跳过分隔符
printf("%s\n",str);
}
++cnt; // 增加词计数
} while (str && *str);
printf("There are %d words\n", cnt); // 5
return 0;
}