书上的练习题,把ini文件模式转换成XML格式

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#include <stdio.h>#include <string.h>#include <stdbool.h>#include <unistd.h>int main(int argc, char *argv[]){        bool flag = false;        char tmp[80];        char st[80];        char name[80], val[80];        FILE *fp, *ofp;        char *p;        if (argc != 3) {        printf("参数不正确\n");        _exit(0);        }        if ((fp = fopen(argv[1], "r")) == NULL || (ofp = fopen(argv[2], "w")) == NULL) {                perror("打开文件出错");                _exit(0);        }        while (fgets(tmp, 80, fp) != NULL) {                char c = 0;                sscanf(tmp, " %c", &c);                switch(c) {                        case ';':                                p = strchr(tmp, '\n');                                if (p != NULL)                                        *p = '\0';                                printf("<!-- %s -->\n", tmp+1);                                fprintf(ofp, "<!-- %s -->\n", tmp+1);                                break;                        case '[':                                p = strchr(tmp, ']');                                if (p == NULL)                                        printf("error\n");                                else {                                        *p = '\0';                                        flag = true;                                        strcpy(st, tmp+1);                                }                                printf("<%s>\n", tmp+1);                                fprintf(ofp, "<%s>\n", tmp+1);                                break;                        case 0:                                if (flag) {                                        printf("</%s>\n\n", st);                                        fprintf(ofp, "</%s>\n\n", st);                                        flag = false;                                }                                break;                        default :                                p = strchr(tmp, '=');                                if (p == NULL)                                        printf("error\n");                                else {                                        *p = '\0';                                        sscanf(tmp, " %s", name);                                        sscanf(p+1, " %s", val);                                        printf("\t<%s>%s</%s>\n", name, val, name);                                        fprintf(ofp, "\t<%s>%s</%s>\n", name, val, name);                                }                }        }        if (flag)                printf("</%s>\n", st);                fprintf(ofp, "</%s>\n", st);        fclose(fp);        fclose(ofp);        return 0;}