templatecontainer.cpp

Oracle调用接口

#include "TemplateContainer.h"

TemplateContainer::TemplateContainer() {
}

TemplateContainer::TemplateContainer(const char *t_name) {
	int f;
	struct stat st;
	string err;
	char r_path[PATH_MAX];
	f=open(t_name,O_RDONLY);
	if(f==-1) { err=string("Cannot open ")+t_name+" reason:"+strerror(errno); goto OPEN_FAILED; }
	if(fstat(f,&st)==-1) { err=string("Cannot stat ")+t_name+" reason:"+strerror(errno); goto STAT_FAILED; }
	template_size=st.st_size;
	tmpl=(char *)mmap(0,template_size,PROT_READ,MAP_SHARED,f,0);
	if(long(tmpl)==-1) { 
		err=string("Failed to map ")+t_name+" reason:"+strerror(errno); 
		goto MMAP_FAILED; 
	}
	line=1; pos=0; cur=0; prev_pos=0;
	if(!realpath(t_name,r_path)) {
		err=string("Cannot get realpath for")+t_name+" reason:"+strerror(errno);
		goto REAL_PATH_FAILED;
	}
	template_dir=r_path;
	template_dir=template_dir.erase(template_dir.rfind("/"));
	return;
REAL_PATH_FAILED:
MMAP_FAILED:
STAT_FAILED:
	close(f);
OPEN_FAILED:	
	throw TemplateError(err);
}

TemplateContainer::~TemplateContainer() {
	if(munmap(tmpl,template_size)==-1) throw TemplateError(string("Failed to munmap reason:")+strerror(errno));
}

char TemplateContainer::next() {
	char c;
	if(cur==template_size) return 0;
	c=tmpl[cur];
	cur++; 
	if(c=='\n') { 
		line++; prev_pos=pos; pos=0; 
	} else { 
		pos++; 
	}
	return c;	
}

void TemplateContainer::prev() {
	if(cur) cur--;
	if(pos) pos--; 
	else {
		if(line) {
			line--;
			pos=prev_pos; 
		} 
	}
}