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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

dtdtsdatatypetoattributevalue

DtDtsDataTypeToAttributeValue(library call)							       DtDtsDataTypeToAttributeValue(library call)

NAME

       DtDtsDataTypeToAttributeValue -- get an attribute value for a specified data type

SYNOPSIS

       #include <Dt/Dts.h>
       char *DtDtsDataTypeToAttributeValue(
       const char *datatype,
       const char *attr_name,
       const char *opt_name);

DESCRIPTION

       The DtDtsDataTypeToAttributeValue returns an attribute value for the specified data type name.

       The datatype argument is a pointer to a data type name string.

       The attr_name argument is a name of the attribute.

       The  opt_name argument can be used to specify a name to be associated with the data type.  If the opt_name argument is not NULL, it is used
       as a pseudo file name in typing; otherwise, certain attributes may be returned as NULL because the filename components could not be  deter-
       mined.

RETURN VALUE

       Upon  successful  completion,  the DtDtsDataTypeToAttributeValue 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.

       The opt_name argument is useful when the attribute being returned contains a modifier string that depends on having a file  name  included.
       For example, if the INSTANCE_ICON attribute had the value %name%.icon, opt_name would be used to derive the %name% portion of the attribute
       value.  See dtdtsfile(4).

EXAMPLES

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

       #include <Dt/Dts.h>
       #define ATTRIBUTE1      "DESCRIPTION"
       #define ATTRIBUTE2      "ACTIONS"
       main (int argc, char **argv)
       {
	       char    *attribute;
	       char    *datatype;
	       /* load data types database */
	       DtDtsLoadDataTypes();
	       argv++;
	       while (*argv) {
		       /* get data type file file */
		       datatype = DtDtsFileToDataType(*argv);
		       /* get first attribute for datatype */
		       attribute = DtDtsDataTypeToAttributeValue(datatype,
					       ATTRIBUTE1, *argv);
		       if (attribute)
			       printf("%s for file %s is %s
",
				       ATTRIBUTE1, *argv, attribute);
		       /* get second attribute for datatype */
		       attribute = DtDtsDataTypeToAttributeValue(datatype,
					       ATTRIBUTE2, NULL);
		       if (attribute)
			       printf("%s for file %s is %s
",
				       ATTRIBUTE2, *argv, attribute);
		       argv++;
	       }
	       DtDtsRelease();
	       exit(0);
       }

SEE ALSO

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

												       DtDtsDataTypeToAttributeValue(library call)
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