my_wc.rar_c实现wc命令_linux wc_linux wc -l

#include <stdio.h> #include <stdlib.h> typedef enum {FALSE = 0,TRUE = 1} bool; int main(int argc, char* argv[]) { char buf[ 100 ]; getcwd(buf, 100); printf("current path is: %s\n", buf); FILE* fp = NULL; int byte_count =0, word_count =0, line_count =0; int ch; bool last_char_is_word = FALSE; /* if there is a command line arg, then try to open it as the file otherwise, use stdin */ fp = stdin; if (argc == 2) { fp = fopen(argv[1],"r"); if (fp == NULL) { fprintf(stderr,"Unable to open file %s. Exiting.\n",argv[1]); exit(1); } } /* read until the end of file, counting chars, words, lines */ while ((ch = fgetc(fp)) != EOF) { if (ch == '\n') { line_count++; if(last_char_is_word) word_count++; last_char_is_word=FALSE; } else if (ch == '\t' || ch == ' ') { if(last_char_is_word) word_count++; last_char_is_word=FALSE; } else last_char_is_word=TRUE; byte_count++; } /* all done. If the input file was not stdin, close it*/ if (fp != stdin) { fclose(fp); } printf("%d\t%d\t%d\t%s",line_count,word_count,byte_count,argv[1]); return 0; }