/* * File: remcom.c * -------------- * This program eliminates comments from a file.  This version * does not ignore comments that appear in a string constant; * that change is left to the reader as an exercise. */#include <stdio.h>#include "genlib.h"#include "simpio.h"/* Private function prototypes */static void CopyRemovingComments(FILE *infile, FILE *outfile);static FILE *OpenUserFile(string prompt, string mode);/* Main program */main(){    FILE *infile;    printf("This program removes comments from a file.\n");    infile = OpenUserFile("Input file:  ", "r");    CopyRemovingComments(infile, stdout);    fclose(infile);}/* * Function: CopyRemovingComments * Usage: CopyRemovingComments(infile, outfile); * --------------------------------------------- * This function copies one file to another, removing comments * as it goes.  The status indicator as to whether a comment is * being read is stored in commentFlag. */static void CopyRemovingComments(FILE *infile, FILE *outfile){    int ch, nch;    bool commentFlag;    commentFlag = FALSE;    while ((ch = getc(infile)) != EOF) {        if (commentFlag) {            if (ch == '*') {                nch = getc(infile);                if (nch == '/') {                    commentFlag = FALSE;                } else {                    ungetc(nch, infile);                }            }        } else {            if (ch == '/') {                nch = getc(infile);                if (nch == '*') {                    commentFlag = TRUE;                } else {                    ungetc(nch, infile);                }            }            if (!commentFlag) putc(ch, outfile);        }    }}/* * Function: OpenUserFile * Usage: fileptr = OpenUserFile(prompt, mode); * -------------------------------------------- * This function prompts the user for a file name using the * prompt string supplied by the user and then attempts to * open that file with the specified mode.  If the file is * opened successfully, OpenUserFile returns the appropriate * file pointer.  If the open operation fails, the user is * informed of the failure and given an opportunity to enter * another file name. */static FILE *OpenUserFile(string prompt, string mode){    string filename;    FILE *result;    while (TRUE) {        printf("%s", prompt);        filename = GetLine();        result = fopen(filename, mode);        if (result != NULL) break;        printf("Can't open the file \"%s\"\n", filename);    }    return (result);}