io.c

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// includes
#include "header.h"

void get_filename(char *in, char *out)
{
        // The input and output filenames are 4 characters longer than 
        // the base filename, hence the "- 4"
        if (strlen(in) < (FILENAME_MAX - 4)) 
                strcpy(out, in);
        else 
                error("Filename length is too long");
}


void get_io_filenames(char *argstring, const char *inf_extension, const char *outf_extension, char *infilename, char *outfilename)
{
        char *strng;

        get_filename(argstring, infilename);
        strcpy(outfilename, infilename);

        strng = index(outfilename, '.');  /* Find the '.' in the filename */
        if (strng == NULL) {    /* If no '.', then add default extensions */
                strcat(infilename, inf_extension);
                strcat(outfilename, outf_extension);
        } else {
                strcpy(strng, outf_extension);  /* Replace ext. with default */
        }
}


int assemble_command(int argc, char *argv[], char *command)
{   
    int i, length;
 
        strcpy(command,argv[0]);
        strcat(command, " ");
        length=strlen(argv[0]) + 1;
        for (i=1; i<argc; i++) {
                length += strlen(argv[i]) + 1;
                if (length > MAX_COMMAND_LENGTH) {
                        printf("Warning: length of command too long to put in struct \n");
                        strcat(command, "...");
                        break;
                }
                strcat(command, argv[i]);
                strcat(command, " ");
        }

        return (i);
}


/*******************************************************************
        This function is for parsing a string which has several 
        doubles delimited by spaces or commas. It uses strtok. 
        The string has parameters for the extra sources. 

        For example, 
                --additional_sources "2 50.0 0.0 100.0 -50.0 0.0 100.0"
                -> 2 means there are 2 additional sources 
                -> +/-50.0, 0.0, and 100.0 mean the sz, sr, and crnt 
                   values for the sources

        Input: string describing the quantity (sz, sr, or crnt) 
                and # of the extra source -- both for diagnostics
        Return: value
*******************************************************************/
double read_source_parameter(char *string, int nsource)
{
        double value;
        char *token;

        token = strtok(NULL, " ,");
        if (token == NULL)
                error("Cannot read %s token; nsource = %d\n", string, nsource);

        value = atof(token);

        return (value);
}