我一直在这段代码上遇到分段错误,我现在正在学习 C ..有人可以帮我吗?
错误位置:
char *m;
char *as = concat("helloworld", buf);
*m = sha1(as); <<<<<< as
printf("%s\n", m);
free(as);
concat 函数(不是我的,用于连接 2 个字符串):
char* concat(char *s1, char *s2)
{
size_t len1 = strlen(s1);
size_t len2 = strlen(s2);
char *result = malloc(len1+len2+1);//+1 for the zero-terminator
//in real code you would check for errors in malloc here
memcpy(result, s1, len1);
memcpy(result+len1, s2, len2+1);//+1 to copy the null-terminator
return result;
}
sha1 函数:
char *sha1( char *val ){
int msg_length = strlen( val );
int hash_length = gcry_md_get_algo_dlen( GCRY_MD_SHA1 );
unsigned char hash[ hash_length ];
char *out = (char *) malloc( sizeof(char) * ((hash_length*2)+1) );
char *p = out;
gcry_md_hash_buffer( GCRY_MD_SHA1, hash, val, msg_length );
int i;
for ( i = 0; i < hash_length; i++, p += 2 ) {
snprintf ( p, 3, "%02x", hash[i] );
}
return out;
}
既然我在问,它们是什么意思:
//in real code you would check for errors in malloc here
提前致谢