数据结构与算法分析（C）1.4

问题描述：编写一个程序，使它读入被include语句修饰的一个文件并且输出这个文件。

分析：这道题的思路很简单，首先，读入源文件，然后在源文件中查找#include，然后获取包含的文件名，然后fread到内存中，如此继续下去。
有个问题纠结了很久：当在查找过程中发现strcpy(include,”#include”);时也会出现”#include”字符，应该对它进行过滤。

//include zuhonglei//#include <stdio.h>#include <string.h>int main(int argc,char *argv[]){    if(argc<1)        return -1;    char *name = argv[0];    char fullName[20];    strcpy(fullName,name);    strcpy(fullName+strlen(name),".c");    printf("%s\n",fullName);    FILE *fp = fopen(fullName,"r+");    if(!fp)        return -1;    char context[4097];    char context2[4097];    context2[4096] = '\0';    context[4096] = '\0';    while(fread(context,sizeof(char),4096,fp)!=0){        printf("%s\n",context);    }    fclose(fp);    //check the name of include     int i,j,index;    char include[10];    strcpy(include,"#include");    index = 0;    int nameIndex = 0;    char fileName[40];    char *prefix = "/usr/include/";    strcpy(fileName,prefix);    int fileLen = strlen(fileName);    for(i = 0;i<4097;i++){          if(context[i]=='/'&&context[i+1]=='/')//delete the whole line //        {            for(j = i;context[j]!='\n';j++);            i = j;            continue;        }        if(include[index]!='\0'){            if(context[i]!=include[index]){                index = 0;            }            else                index++;        }        if(include[index]=='\0'){            int tmp = fileLen;            if(context[i+1]!=' '){            index=0;                continue;            }               while(1){                i++;                if(context[i]=='>'){                    index = 0;                    break;                }                if((context[i]>='a'&&context[i]<='z')||context[i]=='.')                    fileName[tmp++] = context[i];            }            fileName[tmp] = '\0';//delete >            printf("read fileName:%s\n",fileName);            fp = fopen(fileName,"r+");            if(!fp)                return -1;            while(fread(context2,sizeof(char),4096,fp)!=0)                printf("%s\n",context2);            fclose(fp);        }    }    return 0;}
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