bl2.c - 對grep的模仿

這是對grep功能的一個簡單模仿，但不是單純的模仿，它的獨特之處在於能夠保持文本整體的視覺效果。

myst_color.c

/* myst_color.c
 * Written by Myst Shen on Nov. 11, 2008.
 */
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "myst_color.h"

int c, num;
char *rcolor;
NODE * init (FILE *fp){
  head = (NODE *)malloc(sizeof(NODE));
  head->next = NULL;
  tail = head;
  while (1){
    c = fgetc(fp);
    if( c == EOF ) break;
    p = (NODE *)malloc(sizeof(NODE));
    p->val = c;
    p->color = "\33[1;30m";
    p->next = NULL;
      tail->next = p;
      p->prev = tail;
      tail = p;
  }
  return head;
}
char * rand_color (int num) {
  int num1, num2;
  char *color[] = {
    "\33[1;31m",
    "\33[1;32m",
    "\33[1;33m",
    "\33[1;34m",
    "\33[1;35m",
    "\33[1;36m",
    "\33[0;31m",
    "\33[0;32m",
    "\33[0;33m",
    "\33[0;34m",
    "\33[0;35m",
    "\33[0;36m",
  };
  srand((unsigned)time(NULL));
  num1 = rand()%11 +1;
  num2 = num1 - num;
  rcolor = color[num2];
  return rcolor;
}
int print (NODE *pNODE) {
  while(1){
    pNODE = pNODE->next;
    if ( pNODE == NULL ) break;
    printf("%s", pNODE->color);
    printf("%c", pNODE->val);
  }
  putchar ('\n');
  return 0;
}

myst_color.h

/* myst_color.h
 * Written by Myst Shen on Nov. 11, 2008.
 */

#include <stdio.h>
#include <stdlib.h>

typedef struct data {
  int val;
  char *color;
  struct data *prev, *next;
} NODE;

NODE *head, *tail, *p;
FILE *fp;
extern NODE * init(FILE *fp);
extern char * rand_color(int num);
extern int print(NODE *p);

bl2.c

/* bl2.c
 * Written by Myst Shen on Nov. 11, 2008.
 */

#include "stdlib.h"
#include "stdio.h"
#include "myst_color.h"

NODE *h, *node, *node2;
char *color1;
int main (int argc, char **argv){
  char *ch, *ch2;
  if (argc != 3) {
    printf ("Illegal arguments.\n");
    exit(0);
  }
  fp = fopen(argv[2],"r");
  if (!fp) {
    printf ("Sorry, cannot open this file !.\n");
    exit(0);
  }
  color1 = rand_color(1);
  h = init(fp);
  node = h;
  ch = argv[1];
  while (1){
    ch = argv[1];
    ch2 = argv[1];
    if( node == NULL ) break;
    if (node->val == *ch) {
      node2 = node;
      while(node2->val == *ch && *ch != '\0'){
        node2 = node2->next;
        ch++;
      }
    }
    if (*ch == '\0'){
      while (*ch2 != '\0'){
        node2 = node2->prev;
        node2->color = color1;
        ch2++;
      }
    }
    node = node->next;
  }
  print(h);
  return 0;
}

Makefile

CC=cc
CFLAGS = -g -Wall -Wextra -ansi -pedantic -O3
OBJ = myst_color.o bl2.o
bl2: $(OBJ)
      $(CC) $(CFLAGS) -obl2 $(OBJ)
myst_color.o: myst_color.h myst_color.c
bl2.o: myst_color.h bl2.c
clean:
      rm -f bl2 myst_color.o bl2.o