{"id":3577,"date":"2017-08-26T09:50:15","date_gmt":"2017-08-26T01:50:15","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3577"},"modified":"2017-08-26T09:50:15","modified_gmt":"2017-08-26T01:50:15","slug":"linux%e4%b8%8bc%e8%af%ad%e8%a8%80%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%af%94%e8%be%83%e3%80%81%e6%9f%a5%e6%89%be","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3577.html","title":{"rendered":"Linux\u4e0bC\u8bed\u8a00\u4e2d\u7684\u5b57\u7b26\u4e32\u6bd4\u8f83\u3001\u67e5\u627e"},"content":{"rendered":"

=Start=<\/p>\n

\u7f18\u7531\uff1a<\/h4>\n

\u5b66\u4e60\u3001\u63d0\u9ad8\u9700\u8981<\/p>\n

\u6b63\u6587\uff1a<\/h4>\n

\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n
\n
\n
\n
\n\n\n\n
\n
\n
#include <stdio.h><\/code><\/div>\n
#include <string.h><\/code><\/div>\n
#include <stdbool.h>\u00a0<\/code>\/* use bool in C *\/<\/code><\/div>\n
#include <ctype.h>\u00a0<\/code>\/* tolower() *\/<\/code><\/div>\n
\/*<\/code><\/div>\n
The strcmp() and strncmp() functions return an integer less than, equal to, or greater than zero if s1 (or the first n bytes thereof) is found, respectively, to be less than, to match, or be greater than s2.<\/code><\/div>\n
\u8fd4\u56de\u503c > 0 \u8868\u793a\uff1a s1 > s2<\/code><\/div>\n
\u8fd4\u56de\u503c = 0 \u8868\u793a\uff1a s1 = s2<\/code><\/div>\n
\u8fd4\u56de\u503c < 0 \u8868\u793a\uff1a s1 < s2<\/code><\/div>\n
<\/div>\n
int strcmp(const char *s1, const char *s2);<\/code><\/div>\n
int strncmp(const char *s1, const char *s2, size_t n);<\/code><\/div>\n
*\/<\/code><\/div>\n
<\/div>\n
<\/div>\n
\/*<\/code><\/div>\n
\u8fd4\u56de\u503c = 1 \u8868\u793a\uff1a str \u4ee5 prefix \u4e3a\u524d\u7f00<\/code><\/div>\n
\u8fd4\u56de\u503c = 0 \u8868\u793a\uff1a str \u4e0d\u4ee5 prefix \u4e3a\u524d\u7f00<\/code><\/div>\n
*\/<\/code><\/div>\n
bool starts_with(<\/code>const<\/code>\u00a0char<\/code>\u00a0*str,\u00a0<\/code>const<\/code>\u00a0char<\/code>\u00a0*prefix)<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(!str || !prefix)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>if<\/code>(strncmp(str, prefix, strlen(prefix)) ==\u00a0<\/code>0<\/code>)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a01<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
\/*<\/code><\/div>\n
\u8fd4\u56de\u503c = 1 \u8868\u793a\uff1a str \u4ee5 suffix \u4e3a\u540e\u7f00<\/code><\/div>\n
\u8fd4\u56de\u503c = 0 \u8868\u793a\uff1a str \u4e0d\u4ee5 suffix \u4e3a\u540e\u7f00<\/code><\/div>\n
*\/<\/code><\/div>\n
bool ends_with(<\/code>const<\/code>\u00a0char<\/code>\u00a0*str,\u00a0<\/code>const<\/code>\u00a0char<\/code>\u00a0*suffix)<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(!str || !suffix)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>size_t lenstr = strlen(str);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>size_t lensuffix = strlen(suffix);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(lensuffix > lenstr)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a0strncmp(str + lenstr - lensuffix, suffix, lensuffix) ==\u00a0<\/code>0<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n
int<\/code>\u00a0ends_withFoo(<\/code>const<\/code>\u00a0char<\/code>\u00a0*str) {\u00a0<\/code>return<\/code>\u00a0ends_with(str,\u00a0<\/code>\".foo\"<\/code>); }<\/code><\/div>\n
<\/div>\n
\/*<\/code><\/div>\n
\u8fd4\u56de\u503c > 0 \u8868\u793a\uff1a s1 > s2<\/code><\/div>\n
\u8fd4\u56de\u503c = 0 \u8868\u793a\uff1a s1 = s2<\/code><\/div>\n
\u8fd4\u56de\u503c < 0 \u8868\u793a\uff1a s1 < s2<\/code><\/div>\n
*\/<\/code><\/div>\n
int<\/code>\u00a0strcicmp(<\/code>char<\/code>\u00a0const<\/code>\u00a0*s1,\u00a0<\/code>char<\/code>\u00a0const<\/code>\u00a0*s2)<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(!s1 || !s2)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>for<\/code>\u00a0(;; s1++, s2++) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0d = tolower(*s1) - tolower(*s2);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(d !=\u00a0<\/code>0<\/code>\u00a0|| !*s1)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a0d;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
}<\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0main(<\/code>int<\/code>\u00a0argc,\u00a0<\/code>char<\/code>\u00a0const<\/code>\u00a0*argv[])<\/code><\/div>\n
{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(argc <\u00a0<\/code>4<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"Usage:\\n\\t%s string prefix suffix\\n\\n\"<\/code>, argv[<\/code>0<\/code>]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(starts_with(argv[<\/code>1<\/code>], argv[<\/code>2<\/code>])) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"'%s' starts_with '%s'\\n\"<\/code>, argv[<\/code>1<\/code>], argv[<\/code>2<\/code>]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}\u00a0<\/code>else<\/code>\u00a0{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"'%s' not starts_with '%s'\\n\"<\/code>, argv[<\/code>1<\/code>], argv[<\/code>2<\/code>]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(ends_with(argv[<\/code>1<\/code>], argv[<\/code>3<\/code>])) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"'%s' ends_with '%s'\\n\"<\/code>, argv[<\/code>1<\/code>], argv[<\/code>3<\/code>]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}\u00a0<\/code>else<\/code>\u00a0{<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>printf(<\/code>\"'%s' not ends_with '%s'\\n\"<\/code>, argv[<\/code>1<\/code>], argv[<\/code>3<\/code>]);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n

Linux\u4e0bC\u8bed\u8a00\u5b57\u7b26\u4e32\u6bd4\u8f83
\nhttp:\/\/man7.org\/linux\/man-pages\/man3\/strncmp.3.html<\/a>
\nhttp:\/\/man7.org\/linux\/man-pages\/man3\/strncasecmp.3.html<\/a>
\nhttps:\/\/stackoverflow.com\/questions\/8004237\/how-do-i-properly-compare-strings<\/a><\/p>\n

\u5927\u5c0f\u5199\u4e0d\u654f\u611f\u7684\u6bd4\u8f83
\nhttps:\/\/stackoverflow.com\/questions\/5820810\/case-insensitive-string-comp-in-c<\/a><\/p>\n

EndsWith \u7ed3\u5c3e\u6bd4\u8f83
\nhttps:\/\/stackoverflow.com\/questions\/744766\/how-to-compare-ends-of-strings-in-c<\/a><\/p>\n

StartsWith \u5f00\u5934\u6bd4\u8f83
\nhttps:\/\/stackoverflow.com\/questions\/15515088\/how-to-check-if-string-starts-with-certain-string-in-c<\/a>
\nhttps:\/\/stackoverflow.com\/questions\/4770985\/how-to-check-if-a-string-starts-with-another-string-in-c<\/a><\/p>\n

=END=<\/p>\n","protected":false},"excerpt":{"rendered":"

=Start= \u7f18\u7531\uff1a \u5b66\u4e60\u3001\u63d0\u9ad8\u9700\u8981 \u6b63\u6587\uff1a \u53c2\u8003\u89e3\u7b54\uff1a #include <stdio.h> […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,11,7],"tags":[100,30,929,928],"class_list":["post-3577","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-linux","category-programing","tag-c","tag-linux","tag-strcmp","tag-strncmp"],"views":6124,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3577","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=3577"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3577\/revisions"}],"predecessor-version":[{"id":3578,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3577\/revisions\/3578"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=3577"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=3577"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=3577"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}