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Full Discussion: Results Of A Variable Into An Array Using C Language
Top Forums Programming Results Of A Variable Into An Array Using C Language Post 302929350 by jim mcnamara on Friday 19th of December 2014 04:53:06 PM
Old 12-19-2014
Corona corrected your problems. Consider a more generalized approach.
This is not production code. It could use more error checking, for example. I use it for quick and dirty stuff.

It breaks a file into an array of lines based on the \n character.
You could have it break on spaces or punctuation or whatever, in order to emulate creating an array of words in a file. Just change the delimiter in the split call. For large files create a larger result[] array.

You could call split again on a line and split the line by spaces + punctuation to get a word count, for example. You could add a regex call and split on just about anything.


Code:
#include "min.h"

#define AVG_LINE_SZ 20

// from M Rochkind
ssize_t readall(int fd, char *buf, size_t bytes)
 {
     ssize_t bytes_read = 0;
     ssize_t n=0;
     do {
         if ((n = read(fd,
                       &buf[bytes_read],
                       bytes - bytes_read)) == -1)
         {
             if (errno == EINTR)  // resume on INTR
             {
                 continue;
             }
             else
             {              
                 return -1;
             }
         }
         if (n == 0)
             return bytes_read;
         bytes_read += n;
     } while (bytes_read < bytes);
     return bytes_read;
 }

char **split(char **r, char *src, const char *delim)
{
   int i=0;
   char *p=strtok(src, delim);
   for( ; p; p=strtok(NULL, delim) )
   {
      r[i++]=p;
      r[i]=NULL;
   }
   return r;
}

size_t filesize(const char *fname)
{
         struct stat st;
         if(stat(fname, &st)== -1 )
         {
            fprintf(stderr, "cannot stat: %s %s\n", fname, strerror(errno));
            exit(1);
         }
         return st.st_size;
}

char *readfile(char *buf, char *fname, size_t len, char **result)
{
   FILE *fp=fopen(fname, "r");
   if(readall(fileno(fp), buf, len)>0)
   {
     split(result, buf, "\n");  // split on newlines     
     fclose(fp);
   }
   else
   {    
     perror("");
     exit(1);
   }
   return buf;

}

int main(int argc, char **argv)
{
   size_t len=(argc>1)? filesize(argv[1]): 0;
   char *result[8192]={NULL};  // <- this a problem for larger files
   int i=0;
   char *buf=(len>0)? malloc(len+2): NULL;
   if(buf==NULL) {perror(""); exit(1);}
   readfile(buf, argv[1], len, result);
   while(result[i])
     printf("%s\n", result[i++]);
   free(buf);
   return 0;  
}

This User Gave Thanks to jim mcnamara For This Post:
metallica1973
 

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LEARN ABOUT DEBIAN

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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