int
main(int argc, char **argv)
{
Tokenrow tr;
time_t t;
STATIC char ebuf[BUFSIZ];
#if defined(__GNO__) && defined(__STACK_CHECK__)
atexit(printStack);
#endif
setbuf(stderr, ebuf);
t = time(NULL);
curtime = ctime(&t);
maketokenrow(3, &tr);
expandlex();
setup(argc, argv);
fixlex();
iniths();
genline();
process(&tr);
flushout();
fflush(stderr);
exit(nerrs > 0);
return 0;
}
void process(Tokenrow *trp)
{
int anymacros = 0;
for (;;)
{
if (trp->tp >= trp->lp)
{
trp->tp = trp->lp = trp->bp;
outbufp = outbuf;
anymacros |= gettokens(trp, 1);
trp->tp = trp->bp;
}
if (trp->tp->type == END)
{
if (--incdepth >= 0)
{
if (cursource->ifdepth)
error(ERROR, "Unterminated conditional in #include");
unsetsource();
cursource->line += cursource->lineinc;
trp->tp = trp->lp;
genline();
continue;
}
if (ifdepth)
error(ERROR, "Unterminated #if/#ifdef/#ifndef");
break;
}
if (trp->tp->type == SHARP)
{
trp->tp += 1;
control(trp);
}
else if (!skipping && anymacros)
expandrow(trp, NULL);
if (skipping)
setempty(trp);
puttokens(trp);
anymacros = 0;
cursource->line += cursource->lineinc;
if (cursource->lineinc > 1)
{
genline();
}
}
}
/**
* process - 处理c源程序的总函数
* @trp: 用来存储c源程序中的一行Token
*/
void process(Tokenrow *trp) {
int anymacros = 0;
for (;;) {
if (trp->tp >= trp->lp) { /* 如果当前token row中没有有效数据 */
trp->tp = trp->lp = trp->bp; /* 重置token row的当前token指针 */
outp = outbuf; /* 重置输出缓冲区的当前指针 */
anymacros |= gettokens(trp, 1); /* 得到一行Token */
trp->tp = trp->bp;
}
if (trp->tp->type == END) { /* 如果遇到EOFC结束符 */
if (--incdepth >= 0) {
if (cursource->ifdepth)
error(ERROR,"Unterminated conditional in #include");
unsetsource();
cursource->line += cursource->lineinc;
trp->tp = trp->lp;
genline();
continue;
}
if (ifdepth)
error(ERROR, "Unterminated #if/#ifdef/#ifndef");
break;
}
if (trp->tp->type==SHARP) { /* 如果当前Token是'#'字符 */
trp->tp += 1; /* tp移动到token row中的下一个token */
control(trp); /* 处理预处理指令部分（宏定义，条件编译，头文件包含） */
} else if (!skipping && anymacros)
expandrow(trp, NULL);
if (skipping) /* 如果当前是忽略状态 */
setempty(trp); /* 置空当前行 */
puttokens(trp); /* 输出当前行 */
anymacros = 0;
cursource->line += cursource->lineinc;
if (cursource->lineinc>1) {
genline();
}
}
}
int main(int argc, char **argv) {
Tokenrow tr; /* token row */
time_t t; /* 保存当前时间的整数值 */
char ebuf[BUFSIZ]; /* stderr buffer（stderr默认是没有buffer的，我们为其建立一个buffer） */
setbuf(stderr, ebuf); /* 设定标准错误的输出缓冲区为ebuf */
t = time(NULL); /* 获得当前时间的整数值 */
curtime = ctime(&t); /* 获得当前时间的字串值(例如: Sat Jul 4 12:27:13 2003)保存到全局变量curtime中 */
maketokenrow(3, &tr); /* 建立一个 token row（默认分配3个Token结构） */
expandlex(); /* 展开状态机 */
setup(argc, argv); /* 建立关键字hash表;处理命令行选项参数;将输入源文件压栈 */
fixlex(); /* 适时的关闭兼容C++单行注释兼容特性 */
iniths(); /* 初始化hideset，TODO: 啥是hideset？ */
genline(); /* 产生一个行控制(line control)信息 */
process(&tr); /* 开始处理源程序 */
flushout(); /* flush output buffer to stdout */
fflush(stderr); /* flush stderr buffer */
exit(nerrs > 0); /* 退出进程 */
return 0;
}
int main(int argc, char **argv)
{
Tokenrow tr;
time_t t;
char ebuf[BUFSIZ];
setbuf(stderr, ebuf);
t = time(NULL);
curtime = ctime(&t);
maketokenrow(3, &tr);
expandlex();
setup(argc, argv);
fixlex();
iniths();
genline();
process(&tr);
flushout();
fflush(stderr);
exit(nerrs > 0);
return 0;
}
void
doinclude(Tokenrow* trp) {
char fname[256], iname[256];
Includelist* ip;
int angled, len, fd, i;
trp->tp += 1;
if (trp->tp >= trp->lp)
goto syntax;
if (trp->tp->type != STRING && trp->tp->type != LT) {
len = trp->tp - trp->bp;
expandrow(trp, "<include>");
trp->tp = trp->bp + len;
}
if (trp->tp->type == STRING) {
len = trp->tp->len - 2;
if (len > sizeof(fname) - 1)
len = sizeof(fname) - 1;
strncpy(fname, (char*)trp->tp->t + 1, len);
angled = 0;
} else if (trp->tp->type == LT) {
len = 0;
trp->tp++;
while (trp->tp->type != GT) {
if (trp->tp > trp->lp || len + trp->tp->len + 2 >= sizeof(fname))
goto syntax;
strncpy(fname + len, (char*)trp->tp->t, trp->tp->len);
len += trp->tp->len;
trp->tp++;
}
angled = 1;
} else
goto syntax;
trp->tp += 2;
if (trp->tp < trp->lp || len == 0)
goto syntax;
fname[len] = '\0';
appendDirToIncludeList(basepath(fname));
if (fname[0] == '/') {
fd = open(fname, 0);
strcpy(iname, fname);
} else for (fd = -1, i = NINCLUDE - 1; i >= 0; i--) {
ip = &includelist[i];
if (ip->file == NULL || ip->deleted || (angled && ip->always == 0))
continue;
if (strlen(fname) + strlen(ip->file) + 2 > sizeof(iname))
continue;
strcpy(iname, ip->file);
strcat(iname, "/");
strcat(iname, fname);
if ((fd = open(iname, 0)) >= 0)
break;
}
if (Mflag > 1 || (!angled && Mflag == 1)) {
write(1, objname, strlen(objname));
write(1, iname, strlen(iname));
write(1, "\n", 1);
}
if (fd >= 0) {
if (++incdepth > 10)
error(FATAL, "#include too deeply nested");
setsource((char*)newstring((uchar*)iname, strlen(iname), 0), fd, NULL);
genline();
} else {
trp->tp = trp->bp + 2;
error(ERROR, "Could not find include file %r", trp);
}
return;
syntax:
error(ERROR, "Syntax error in #include");
return;
}
