Simple Text Parsing.. Long Time Since College

Hello all,
I was hoping someone wouldn't mind pointing me in the right direction. It's been a long while since my last C programming class in college ;)

I'm looking to parse a text file.

Looking like this:
yellow 111111
yellow 222222
yellow 333333
blue 111112
blue 111113
green 222221
green 222223
green 222224
green 222225

or this:
111111 yellow
222222 yellow
333333 yellow
111112 blue
111113 blue
222221 green
222223 green
222224 green
222225 green


basically what i need is to embed the numbers in the colors with open and close tags. the output should look like:

#opencolor#yellow
#number#111111
#number#222222
#number#333333
#closecolor#yellow
#opencolor#blue
#number#111112
#number#111113
#closecolor#blue
#opencolor#green
#number#222221
#number#222223
#number#222224
#number#222225
#closecolor#green


i'm just hoping someone can point me in a direction to start, or a suggestion on how to go about this.

any help is appreciated.

thanks in advance.

Code:

---

itsme@itsme:~/C$ cat tags.c
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>

int main(void)
{
  FILE *fp;
  char buf[100], curcolor[100] = "";
  char *p;
  int num;

  if(!(fp = fopen("tags.txt", "r")))
  {
    perror("fopen()");
    exit(EXIT_FAILURE);
  }

  while(fgets(buf, sizeof(buf), fp))
  {
    if(*buf && buf[strlen(buf)-1] == '\n')
      buf[strlen(buf)-1] = '\0';
    num = strtol(buf, &p, 10);
    if(*p)
      p++;
    if(!strcmp(curcolor, p))
      printf("#number#%d\n", num);
    else
    {
      if(*curcolor)
        printf("#closecolor#%s\n", curcolor);
      strcpy(curcolor, p);
      printf("#opencolor#%s\n", curcolor);
      printf("#number#%d\n", num);
    }
  }

  fclose(fp);

  if(*curcolor)
    printf("#closecolor#%s\n", curcolor);

  return EXIT_SUCCESS;
}
itsme@itsme:~/C$ cat tags.txt
111111 yellow
222222 yellow
333333 yellow
111112 blue
111113 blue
222221 green
222223 green
222224 green
222225 green
itsme@itsme:~/C$ ./tags
#opencolor#yellow
#number#111111
#number#222222
#number#333333
#closecolor#yellow
#opencolor#blue
#number#111112
#number#111113
#closecolor#blue
#opencolor#green
#number#222221
#number#222223
#number#222224
#number#222225
#closecolor#green
itsme@itsme:~/C$

---

Wait, I changed my mind! I like this version better :)

Code:

---

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

int main(void)
{
  FILE *fp;
  char buf[100], curcolor[100] = "";
  char *p;

  if(!(fp = fopen("tags.txt", "r")))
  {
    perror("fopen()");
    exit(EXIT_FAILURE);
  }

  while(fgets(buf, sizeof(buf), fp))
  {
    if(*buf && buf[strlen(buf)-1] == '\n')
      buf[strlen(buf)-1] = '\0';

    if((p = strchr(buf, ' ')))
      *p++ = '\0';
    else  // Ignore bad lines
      continue;

    if(!strcmp(curcolor, p))
      printf("#number#%s\n", buf);
    else
    {
      if(*curcolor)
        printf("#closecolor#%s\n", curcolor);
      strcpy(curcolor, p);
      printf("#opencolor#%s\n", curcolor);
      printf("#number#%s\n", buf);
    }
  }

  fclose(fp);

  if(*curcolor)
    printf("#closecolor#%s\n", curcolor);

  return EXIT_SUCCESS;
}

---

bravo!

thanks a million! i've edited it to accept a filename from the command line and enter a file name to write to. does this look correct?

Code:

---

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

void main(int arcg, char *argv[])
{
  FILE *infile, *outfile;
  char buf[100], curstr[100] = "";
  char *p;
  char file1[20] = " ";
  char file2[20] = " ";

  if (arcg != 3) {printf("STRIP [file to parse] [file to write to]\n");
  return;
  }

 strcpy(file1, argv[1]);
 strcpy(file2, argv[2]);

 if ((infile = fopen(file1,"r")) == NULL) { printf("The file that you want\n");  printf("scanned is not found.  Try again.");
                              return;}
  if ((outfile  = fopen(file2,"w")) == NULL){ fclose(infile); return;}


  while(fgets(buf, sizeof(buf), infile))
  {
    if(*buf && buf[strlen(buf)-1] == '\n')
      buf[strlen(buf)-1] = '\0';

    if((p = strchr(buf, ' ')))
      *p++ = '\0';
    else  // Ignore bad lines
      continue;

    if(!strcmp(curstr, p))
      fprintf(outfile,"#TAP#%s\n", buf);
    else
    {
      if(*curstr)
        fprintf(outfile,"#CTO#%s\n", curstr);
      strcpy(curstr, p);
      fprintf(outfile,"#CTO#%s\n", curstr);
      fprintf(outfile,"#TAP#%s\n", buf);
    }
  }

  fclose(infile);

  if(*curstr)
    fprintf(outfile,"#CTC#%s\n", curstr);

}

---

Don't forget to fclose(outfile); also.