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/*! @file dreadrb.c
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 * \brief Read a matrix stored in Rutherford-Boeing format
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 *
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 * 
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 * -- SuperLU routine (version 4.0) --
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 * Lawrence Berkeley National Laboratory.
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 * June 30, 2009
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 * 
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 *
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 * Purpose
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 * =======
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 *
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 * Read a DOUBLE PRECISION matrix stored in Rutherford-Boeing format 
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 * as described below.
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 *
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 * Line 1 (A72, A8)
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 *      Col. 1 - 72   Title (TITLE)
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 *      Col. 73 - 80  Matrix name / identifier (MTRXID)
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 *
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 * Line 2 (I14, 3(1X, I13))
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 *      Col. 1 - 14   Total number of lines excluding header (TOTCRD)
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 *      Col. 16 - 28  Number of lines for pointers (PTRCRD)
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 *      Col. 30 - 42  Number of lines for row (or variable) indices (INDCRD)
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 *      Col. 44 - 56  Number of lines for numerical values (VALCRD)
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 *
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 * Line 3 (A3, 11X, 4(1X, I13))
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 *      Col. 1 - 3    Matrix type (see below) (MXTYPE)
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 *      Col. 15 - 28  Compressed Column: Number of rows (NROW)
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 *                    Elemental: Largest integer used to index variable (MVAR)
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 *      Col. 30 - 42  Compressed Column: Number of columns (NCOL)
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 *                    Elemental: Number of element matrices (NELT)
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 *      Col. 44 - 56  Compressed Column: Number of entries (NNZERO)
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 *                    Elemental: Number of variable indeces (NVARIX)
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 *      Col. 58 - 70  Compressed Column: Unused, explicitly zero
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 *                    Elemental: Number of elemental matrix entries (NELTVL)
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 *
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 * Line 4 (2A16, A20)
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 *      Col. 1 - 16   Fortran format for pointers (PTRFMT)
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 *      Col. 17 - 32  Fortran format for row (or variable) indices (INDFMT)
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 *      Col. 33 - 52  Fortran format for numerical values of coefficient matrix
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 *                    (VALFMT)
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 *                    (blank in the case of matrix patterns)
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 *
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 * The three character type field on line 3 describes the matrix type.
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 * The following table lists the permitted values for each of the three
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 * characters. As an example of the type field, RSA denotes that the matrix
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 * is real, symmetric, and assembled.
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 *
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 * First Character:
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 *      R Real matrix
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 *      C Complex matrix
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 *      I integer matrix
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 *      P Pattern only (no numerical values supplied)
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 *      Q Pattern only (numerical values supplied in associated auxiliary value
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 *        file)
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 *
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 * Second Character:
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 *      S Symmetric
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 *      U Unsymmetric
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 *      H Hermitian
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 *      Z Skew symmetric
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 *      R Rectangular
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 *
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 * Third Character:
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 *      A Compressed column form
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 *      E Elemental form
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 *
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 * 
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 */
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#include "slu_ddefs.h"
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/*! \brief Eat up the rest of the current line */
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static int dDumpLine(FILE *fp)
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{
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    register int c;
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    while ((c = fgetc(fp)) != '\n') ;
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    return 0;
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}
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static int dParseIntFormat(char *buf, int *num, int *size)
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{
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    char *tmp;
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    tmp = buf;
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    while (*tmp++ != '(') ;
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    sscanf(tmp, "%d", num);
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    while (*tmp != 'I' && *tmp != 'i') ++tmp;
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    ++tmp;
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    sscanf(tmp, "%d", size);
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    return 0;
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}
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static int dParseFloatFormat(char *buf, int *num, int *size)
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{
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    char *tmp, *period;
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    tmp = buf;
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    while (*tmp++ != '(') ;
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    *num = atoi(tmp); /*sscanf(tmp, "%d", num);*/
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    while (*tmp != 'E' && *tmp != 'e' && *tmp != 'D' && *tmp != 'd'
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           && *tmp != 'F' && *tmp != 'f') {
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        /* May find kP before nE/nD/nF, like (1P6F13.6). In this case the
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           num picked up refers to P, which should be skipped. */
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        if (*tmp=='p' || *tmp=='P') {
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           ++tmp;
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           *num = atoi(tmp); /*sscanf(tmp, "%d", num);*/
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        } else {
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           ++tmp;
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        }
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    }
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    ++tmp;
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    period = tmp;
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    while (*period != '.' && *period != ')') ++period ;
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    *period = '\0';
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    *size = atoi(tmp); /*sscanf(tmp, "%2d", size);*/
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    return 0;
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}
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static int ReadVector(FILE *fp, int n, int *where, int perline, int persize)
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{
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    register int i, j, item;
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    char tmp, buf[100];
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    i = 0;
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    while (i < n) {
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        fgets(buf, 100, fp);    /* read a line at a time */
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        for (j=0; j
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            tmp = buf[(j+1)*persize];     /* save the char at that place */
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            buf[(j+1)*persize] = 0;       /* null terminate */
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            item = atoi(&buf[j*persize]); 
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            buf[(j+1)*persize] = tmp;     /* recover the char at that place */
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            where[i++] = item - 1;
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        }
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    }
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    return 0;
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}
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static int dReadValues(FILE *fp, int n, double *destination, int perline,
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        int persize)
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{
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    register int i, j, k, s;
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    char tmp, buf[100];
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    i = 0;
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    while (i < n) {
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        fgets(buf, 100, fp);    /* read a line at a time */
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        for (j=0; j
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            tmp = buf[(j+1)*persize];     /* save the char at that place */
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            buf[(j+1)*persize] = 0;       /* null terminate */
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            s = j*persize;
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            for (k = 0; k < persize; ++k) /* No D_ format in C */
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                if ( buf[s+k] == 'D' || buf[s+k] == 'd' ) buf[s+k] = 'E';
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            destination[i++] = atof(&buf[s]);
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            buf[(j+1)*persize] = tmp;     /* recover the char at that place */
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        }
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    }
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    return 0;
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}
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void
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dreadrb(int *nrow, int *ncol, int *nonz,
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        double **nzval, int **rowind, int **colptr)
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{
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    register int i, numer_lines = 0;
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    int tmp, colnum, colsize, rownum, rowsize, valnum, valsize;
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    char buf[100], type[4];
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    FILE *fp;
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    fp = stdin;
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    /* Line 1 */
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    fgets(buf, 100, fp);
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    fputs(buf, stdout);
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    /* Line 2 */
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    for (i=0; i<4; i++) {
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        fscanf(fp, "%14c", buf); buf[14] = 0;
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        sscanf(buf, "%d", &tmp);
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        if (i == 3) numer_lines = tmp;
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    }
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    dDumpLine(fp);
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    /* Line 3 */
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    fscanf(fp, "%3c", type);
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    fscanf(fp, "%11c", buf); /* pad */
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    type[3] = 0;
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#ifdef DEBUG
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    printf("Matrix type %s\n", type);
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#endif
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    fscanf(fp, "%14c", buf); sscanf(buf, "%d", nrow);
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    fscanf(fp, "%14c", buf); sscanf(buf, "%d", ncol);
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    fscanf(fp, "%14c", buf); sscanf(buf, "%d", nonz);
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    fscanf(fp, "%14c", buf); sscanf(buf, "%d", &tmp);
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    if (tmp != 0)
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        printf("This is not an assembled matrix!\n");
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    if (*nrow != *ncol)
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        printf("Matrix is not square.\n");
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    dDumpLine(fp);
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    /* Allocate storage for the three arrays ( nzval, rowind, colptr ) */
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    dallocateA(*ncol, *nonz, nzval, rowind, colptr);
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    /* Line 4: format statement */
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    fscanf(fp, "%16c", buf);
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    dParseIntFormat(buf, &colnum, &colsize);
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    fscanf(fp, "%16c", buf);
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    dParseIntFormat(buf, &rownum, &rowsize);
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    fscanf(fp, "%20c", buf);
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    dParseFloatFormat(buf, &valnum, &valsize);
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    dDumpLine(fp);
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#ifdef DEBUG
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    printf("%d rows, %d nonzeros\n", *nrow, *nonz);
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    printf("colnum %d, colsize %d\n", colnum, colsize);
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    printf("rownum %d, rowsize %d\n", rownum, rowsize);
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    printf("valnum %d, valsize %d\n", valnum, valsize);
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#endif
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    ReadVector(fp, *ncol+1, *colptr, colnum, colsize);
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    ReadVector(fp, *nonz, *rowind, rownum, rowsize);
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    if ( numer_lines ) {
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        dReadValues(fp, *nonz, *nzval, valnum, valsize);
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    }
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    fclose(fp);
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}