- 论坛徽章:
- 0
|
小弟在读 httpd源码时其中有一段分析分析客户端请求的代码看不太懂，只大概知道需要从客户端请求字符串中解析出请求的命令，请求的文件，请求的文件类型。代码的细节还望高手帮忙注释下，不胜感激！
int ParseReq(FILE *f, char *r)
{
char *bp;
struct stat stbuf;
char * arg;
char * c;
int e;
int raw;
#ifdef DEBUG
printf("req is '%s'\n", r);
#endif
while(*(++r) != ' '); /*skip non-white space*/ /*r 待解析的字符串指针*/
while(isspace(*r)) /*一个空格 or not*/
r++;
while (*r == '/')
r++;
bp = r;
/**r = '.';*/
while(*r && (*(r) != ' ') && (*(r) != '?'))
r++;
#ifdef DEBUG
printf("bp='%s', r='%s'\n", bp, r);
#endif
if (*r == '?')
{
char * e;
*r = 0;
arg = r+1;
if (e = strchr(arg,' '))
{
*e = '\0';
}
} else
{
arg = 0;
*r = 0;
}
c = bp;
if (c[0] == '\0') strcat(c,".");
if (c && !stat(c, &stbuf))
{
if (S_ISDIR(stbuf.st_mode))
{
char * end = c + strlen(c);
strcat(c, "/index.html");
if (!stat(c, &stbuf))
{
DoHTML(f, c);
}
else
{
*end = '\0';
DoDir(f,c);
}
}
else if (!strcmp(r - 4, ".gif"))
DoGif(f,c);
else if (!strcmp(r - 4, ".jpg") || !strcmp(r - 5, ".jpeg"))
DoJpeg(f,c);
else if (!strcmp(r - 4, ".htm") || !strcmp(r - 5, ".html"))
DoHTML(f,c);
else
DoText(f,c);
} else
{
PrintHeader(f,'h');
alarm(TIMEOUT);
fprintf(f, "<html><head><title>404 File Not Found</title></head>\n");
fprintf(f, "<body>The requested URL was not found on this server</body></html>\n");
alarm(0);
}
return 0;
} |
|
免费注册
发表于 2008-05-01 21:04