substring - Mips中的子串

Question

如何在Mips中获取字符串的子字符串？

Answer 1

只需获取一个交叉编译器，用C对其进行编码并获得输出程序集。如果使用gcc，则可以使用-S选项。

例如:

根@:〜/ stackoverflow＃cat strstr.c

    #include <string.h>

    /*
     * Find the first occurrence of find in s.
     */
    char *
    strstr(const char *s, const char *find)
    {
            char c, sc;
            size_t len;


            if ((c = *find++) != 0) {
                    len = strlen(find);
                    do {
                            do {
                                    if ((sc = *s++) == 0)
                                            return (NULL);
                            } while (sc != c);
                    } while (strncmp(s, find, len) != 0);
                    s--;
            }
            return (s);
    }

root @:〜/ stackoverflow＃gcc -S -mrnames
strstr.c -o strstr.s

    strstr.c: In function `strstr':
    strstr.c:23: warning: return discards qualifiers from pointer target type

根@:〜/ stackoverflow＃