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Full Discussion: A Basic example of socket programming in C
Special Forums IP Networking A Basic example of socket programming in C Post 302999282 by Corona688 on Friday 16th of June 2017 11:47:22 AM
Old 06-16-2017
Here's code which reads files in order when given as commandline arguments:

Code:
#include <stdio.h>

char line[4096];
char **files=NULL;
int filenum=0;
FILE *file=NULL;

// Close current file if any, open next from files[]
FILE *next_file() {
        if(file)
        {
                fclose(file);
                file=NULL;
        }

        if(files[filenum] == NULL) return(file=NULL); // out of files
        return(file=fopen(files[filenum++], "r"));
}

char *next_line(void) {
        // Keep trying to get a line until we get a line or run out of files
        while(1)
        {
                // If something is open, try and read it.
                // If we read it, return the line.
                if(file && fgets(line, 4096, file)) return(line);

                // If we're out of files, return error immediately.
                if(files[filenum] == NULL) return(NULL); // out of files

                // Close current and open next file
                next_file(files);
        }

        return(line);
}

void main(int argc, char *argv[]) {
        // get list of files from argv.
        // argv is organized like { "programname", "arg1", "arg2", "arg3", NULL }
        files=argv;
        filenum=1;      // valid arguments in argv[] start at 1

        while(next_line())
        {
                fputs(line, stdout);
                sleep(3);
        }
}

Being able to call next_line repeatedly without worrying about which file is open should make it easier.
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT HPUX

dtdtsfiletoattributevalue

DtDtsFileToAttributeValue(library call) 								   DtDtsFileToAttributeValue(library call)

NAME

       DtDtsFileToAttributeValue -- get a specified attribute value for a file

SYNOPSIS

       #include <Dt/Dts.h>
       char *DtDtsFileToAttributeValue(
       const char *filepath,
       const char *attr_name);

DESCRIPTION

       The DtDtsFileToAttributeValue function returns a data attribute value for the specified file.

       The filepath argument is the pathname of the file.

       The attr_name argument is a pointer to an attribute name string.

RETURN VALUE

       Upon  successful completion, the DtDtsFileToAttributeValue function returns a pointer to a data attribute value string, or NULL if no value
       could be determined.

APPLICATION USAGE

       The application should use the DtDtsFreeAttributeValue(3) function to release the memory for the returned value.

EXAMPLES

       The following takes a list of files as arguments and determines the description of the data type for each file:

       #include <Dt/Dts.h>
       #define ATTRIBUTE       "DESCRIPTION"
       main (int argc, char **argv)
       {
	       char    *attribute;
	       /* load data types database */
	       DtDtsLoadDataTypes();
	       argv++;
	       while (*argv) {
		       /* get attribute for file */
		       attribute = DtDtsFileToAttributeValue(*argv, ATTRIBUTE);
		       if (attribute)
			       printf("%s: %s
", *argv, attribute);
		       argv++;
	       }
	       DtDtsRelease();
	       exit(0);
       }

SEE ALSO

       Dt/Dts.h, DtDtsLoadDataTypes(3), DtDtsRelease(3), DtDtsFreeAttributeValue(3).

													   DtDtsFileToAttributeValue(library call)
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