修改一个类ini文件中某几个变量的值的C代码

同事的一个朋友让她写一个小程序，修改一个文本文件中某几个变量的值（这个文本文件和ini文件比较像，但并不完全符合ini文件的格式，因此不能调用WritePrivateProfileString来修改）。听到这我马上就想说，用Perl或Python来做这事，该是多么简单啊！不过既然现在工作是用VC，就写一段温习温习吧。

#include <stdio.h> #include <stdlib.h> #include <string.h> char *readfile(const char *filename) { FILE *file = fopen(filename, "rb"); char *buf = NULL; if (file) { fseek(file, 0, SEEK_END); int size = ftell(file); rewind(file); buf = (char*)malloc(size + 1); fread(buf, 1, size, file); fclose(file); buf[size] = 0; } return buf; } int writefile(const char *filename, const char *buf) { FILE *file = fopen(filename, "wb"); int done = 0; if (file) { done = fwrite(buf, 1, strlen(buf), file); fclose(file); } return done; } char *getline(char *buf, char *line) { static char *last_buf = NULL; char *p = NULL; if (last_buf != buf) { p = strtok(buf, "/n"); last_buf = buf; } else { p = strtok(NULL, "/n"); } if (p) { strcpy(line, p); } return p; } int main(int argc, char* argv[]) { char *buf = readfile("test.txt"); const SECT_COUNT = 2; char *repl_sect[SECT_COUNT*2] = {"server.max-worker", "5", "server.max-connections", "200000"}; if (buf) { char *outbuf = (char*)malloc(strlen(buf)*2); *outbuf = 0; char *line = (char*)malloc(strlen(buf)); while (getline(buf, line)) { for (int i=0; i<SECT_COUNT; i++) { char *p_sect = repl_sect[i*2]; if (strncmp(line, p_sect, strlen(p_sect)) == 0) { strcpy(line + strlen(p_sect), " = "); strcat(line, repl_sect[i*2+1]); strcat(line, "/r"); break; } } strcat(line, "/n"); strcat(outbuf, line); } writefile("test.txt", outbuf); free(line); free(outbuf); free(buf); } return 0; }