The R Project SVN R

/*
 *  R : A Computer Language for Statistical Data Analysis
 *  Copyright (C) 2002-7     the R Development Core Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street Fifth Floor, Boston, MA 02110-1301  USA
 *
 * Originally written by Jonathan Rougier, email J.C.Rougier@durham.ac.uk
*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <Defn.h>
#include "RBufferUtils.h"

#define MAXLINE MAXELTSIZE

SEXP attribute_hidden do_sprintf(SEXP call, SEXP op, SEXP args, SEXP env)
{
    int i, nargs, cnt, v, thislen, nfmt;
    const char *formatString, *ss; char *starc;
    /* fmt2 is a copy of fmt with '*' expanded.
       bit will hold numeric formats and %<w>s, so be quite small. */
    char fmt[MAXLINE+1], fmt2[MAXLINE+10], *fmtp, bit[MAXLINE+1], 
    *outputString;
    size_t n, cur, chunk;

    SEXP format, ans, _this, a[100], tmp;
    int ns, maxlen, lens[100], nthis, has_star, star_arg = 0, nstar;
    static R_StringBuffer outbuff = {NULL, 0, MAXELTSIZE};

    outputString = R_AllocStringBuffer(0, &outbuff);

    /* grab the format string */
    nargs = length(args);
    format = CAR(args);
    if (!isString(format) || length(format) == 0)
    error(_("'fmt' is not a non-empty character vector"));
    args = CDR(args); nargs--;
    if(nargs >= 100)
    error(_("only 100 arguments are allowed"));

    /* record the args for later re-ordering */
    for(i = 0; i < nargs; i++, args = CDR(args)) a[i] = CAR(args);

    maxlen = nfmt = length(format);
    for(i = 0; i < nargs; i++) {
    lens[i] = length(a[i]);
    if(lens[i] == 0)
        error(_("zero-length argument"));
    if(maxlen < lens[i]) maxlen = lens[i];
    }
    if(maxlen % length(format))
    error(_("arguments cannot be recycled to the same length"));
    for(i = 0; i < nargs; i++)
    if(maxlen % lens[i])
        error(_("arguments cannot be recycled to the same length"));

    /* FIXME?  pull format analysis and conversion outside the loop if
       there is only one format */

    PROTECT(ans = allocVector(STRSXP, maxlen));
    for(ns = 0; ns < maxlen; ns++) {
    cnt = 0;
    outputString[0] = '\0';
    formatString = translateChar(STRING_ELT(format, ns % nfmt));
    n = strlen(formatString);
    if (n > MAXLINE)
        error(_("'fmt' length exceeds maximal format length %d"),
          MAXLINE);
    /* process the format string */
    for (cur = 0; cur < n; cur += chunk) {
        ss = NULL;
        if (formatString[cur] == '%') { /* handle special format command */

        if (cur < n - 1 && formatString[cur + 1] == '%') {
            /* take care of %% in the format */
            chunk = 2;
            strcpy(bit, "%");
        }
        else {
            /* recognise selected types from Table B-1 of K&R */
            /* This is MBCS-OK, as we are in a format spec */
            chunk = strcspn(formatString + cur + 1, "disfeEgGxX%") + 2;
            if (cur + chunk > n)
            error(_("unrecognised format at end of string"));

            strncpy(fmt, formatString + cur, chunk);
            fmt[chunk] = '\0';

            nthis = -1;
            /* now look for %n$ or %nn$ form */
            if (strlen(fmt) > 3 && fmt[1] >= '1' && fmt[1] <= '9') {
            v = fmt[1] - '0';
            if(fmt[2] == '$') {
                if(v > nargs)
                error(_("reference to non-existent argument %d"), v);
                nthis = v-1;
                memmove(fmt+1, fmt+3, strlen(fmt)-2);
            } else if(fmt[2] >= '1' && fmt[2] <= '9' 
                  && fmt[3] == '$') {
                v = 10*v + fmt[2] - '0';
                if(v > nargs)
                error(_("reference to non-existent argument %d"), v);
                nthis = v-1;
                memmove(fmt+1, fmt+4, strlen(fmt)-3);
            }
            }

            has_star = 0;
            starc = Rf_strchr(fmt, '*');
            if (starc) { /* handle * format if present */
            nstar = -1;
            if (strlen(starc) > 3 && starc[1] >= '1' && starc[1] <= '9') {
                v = starc[1] - '0';
                if(starc[2] == '$') {
                if(v > nargs)
                    error(_("reference to non-existent argument %d"), v);
                nstar = v-1;
                memmove(starc+1, starc+3, strlen(starc)-2);
                } else if(starc[2] >= '1' && starc[2] <= '9' 
                      && starc[3] == '$') {
                v = 10*v + starc[2] - '0';
                if(v > nargs)
                    error(_("reference to non-existent argument %d"), v);
                nstar = v-1;
                memmove(starc+1, starc+4, strlen(starc)-3);
                }
            }

            if(nstar < 0) {
                if (cnt >= nargs) error(_("too few arguments"));
                nstar = cnt++;
            }

            if (Rf_strchr(starc+1, '*'))
                error(_("at most one asterisk `*' is supported in each conversion specification"));

            _this = a[nstar];
            if(TYPEOF(_this) == REALSXP)
                _this = coerceVector(_this, INTSXP);
            if(TYPEOF(_this) != INTSXP || LENGTH(_this)<1 ||
               INTEGER(_this)[ns % LENGTH(_this)] == NA_INTEGER)
                error(_("argument for `*' conversion specification must be a number"));
            has_star = 1;
            star_arg = INTEGER(_this)[ns % LENGTH(_this)];
            }

            if (fmt[strlen(fmt) - 1] == '%') {
            /* handle % with formatting options */
            if (has_star)
                sprintf(bit, fmt, star_arg);
            else
                sprintf(bit, fmt);
            } else {
            if(nthis < 0) {
                if (cnt >= nargs) error(_("too few arguments"));
                nthis = cnt++;
            }
            _this = a[nthis];
            if (has_star) {
                char *p, *q = fmt2;
                for (p = fmt; *p; p++)
                if (*p == '*') q += sprintf(q, "%d", star_arg);
                else *q++ = *p;
                *q = '\0';
                fmtp = fmt2;
            } else fmtp = fmt;
            
            /* Now let us see if some minimal coercion would be sensible.
             */
            switch(fmtp[strlen(fmtp) - 1]) {
            case 'd':
            case 'i':
            case 'x':
            case 'X':
                if(TYPEOF(_this) == REALSXP) {
                double r = REAL(_this)[0];
                if((double)((int) r) == r)
                    _this = coerceVector(_this, INTSXP);
                }
                break;
            case 'e':
            case 'f':
            case 'g':
            case 'E':
            case 'G':
                if(TYPEOF(_this) != REALSXP) {
                PROTECT(tmp = lang2(install("as.double"), _this));
                _this = eval(tmp, env);
                UNPROTECT(1);
                }
                break;
            case 's':
                if(TYPEOF(_this) != STRSXP) {
                PROTECT(tmp = 
                    lang2(install("as.character"), _this));
                _this = eval(tmp, env);
                UNPROTECT(1);
                }
                break;
            default:
                break;
            }
            PROTECT(_this);
            thislen = length(_this);
            if(thislen == 0)
                error(_("coercion has changed vector length to 0"));
            
            switch(TYPEOF(_this)) {
            case LGLSXP:
                {
                int x = LOGICAL(_this)[ns % thislen];
                if (strcspn(fmtp, "di") >= strlen(fmtp))
                    error("%s", 
                      _("use format %d or %i for logical objects"));
                if (x == NA_LOGICAL) {
                    fmtp[strlen(fmtp)-1] = 's';
                    sprintf(bit, fmtp, "NA");
                } else {
                    sprintf(bit, fmtp, x);
                }
                break;
                }
            case INTSXP:
                {
                int x = INTEGER(_this)[ns % thislen];
                if (strcspn(fmtp, "dixX") >= strlen(fmtp))
                    error("%s",
                      _("use format %d, %i, %x or %X for integer objects"));
                if (x == NA_INTEGER) {
                    fmtp[strlen(fmtp)-1] = 's';
                    sprintf(bit, fmtp, "NA");
                } else {
                    sprintf(bit, fmtp, x);
                }
                break;
                }
            case REALSXP:
                {
                double x = REAL(_this)[ns % thislen];
                if (strcspn(fmtp, "feEgG") >= strlen(fmtp))
                    error("%s", 
                      _("use format %f, %e or %g for numeric objects"));
                if (R_FINITE(x)) {
                    sprintf(bit, fmtp, x);
                } else {
                    char *p = Rf_strchr(fmtp, '.');
                    if (p) {
                    *p++ = 's'; *p ='\0';
                    } else
                    fmtp[strlen(fmtp)-1] = 's';
                    if (ISNA(x)) {
                    if (strcspn(fmtp, " ") < strlen(fmtp))
                        sprintf(bit, fmtp, " NA");
                    else
                        sprintf(bit, fmtp, "NA");
                    } else if (ISNAN(x)) {
                    if (strcspn(fmtp, " ") < strlen(fmtp))
                        sprintf(bit, fmtp, " NaN");
                    else
                        sprintf(bit, fmtp, "NaN");
                    } else if (x == R_PosInf) {
                    if (strcspn(fmtp, "+") < strlen(fmtp))
                        sprintf(bit, fmtp, "+Inf");
                    else if (strcspn(fmtp, " ") < strlen(fmtp))
                        sprintf(bit, fmtp, " Inf");
                    else
                        sprintf(bit, fmtp, "Inf");
                    } else if (x == R_NegInf)
                    sprintf(bit, fmtp, "-Inf");
                }
                break;
                }
            case STRSXP:
                /* NA_STRING will be printed as `NA' */
                if (strcspn(fmtp, "s") >= strlen(fmtp))
                error("%s", _("use format %s for character objects"));
                ss = translateChar(STRING_ELT(_this, ns % thislen));
                if(fmtp[1] != 's') {
                if(strlen(ss) > MAXLINE)
                    warning(_("Likely truncation of character string"));
                snprintf(bit, MAXLINE, fmtp, ss);
                bit[MAXLINE] = '\0';
                ss = NULL;
                }
                break;
                
            default:
                error(_("unsupported type"));
                break;
            }

            UNPROTECT(1);
            }
        }
        }
        else { /* not '%' : handle string part */
        char *ch = Rf_strchr(formatString + cur, '%'); /* MBCS-aware
                                  version used */
        if(ch) chunk = ch - formatString - cur;
        else chunk = strlen(formatString + cur);
        strncpy(bit, formatString + cur, chunk);
        bit[chunk] = '\0';
        }
        if(ss) {
        outputString = R_AllocStringBuffer(strlen(outputString) + 
                           strlen(ss) + 1, &outbuff);
        strcat(outputString, ss);
        } else {
        outputString = R_AllocStringBuffer(strlen(outputString) + 
                           strlen(bit) + 1, &outbuff);
        strcat(outputString, bit);
        
        }
    }
    SET_STRING_ELT(ans, ns, mkChar(outputString));
    }

    UNPROTECT(1);
    R_FreeStringBufferL(&outbuff);
    return ans;
}

/* Local Variables: */
/* indent-tabs-mode: t */
/* c-basic-offset: 4 */
/* End: */