github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/printf/doprnti.c (about)

     1  /* __gmp_doprnt_integer -- integer style formatted output.
     2  
     3     THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY.  THEY'RE ALMOST
     4     CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
     5     FUTURE GNU MP RELEASES.
     6  
     7  Copyright 2001 Free Software Foundation, Inc.
     8  
     9  This file is part of the GNU MP Library.
    10  
    11  The GNU MP Library is free software; you can redistribute it and/or modify
    12  it under the terms of either:
    13  
    14    * the GNU Lesser General Public License as published by the Free
    15      Software Foundation; either version 3 of the License, or (at your
    16      option) any later version.
    17  
    18  or
    19  
    20    * the GNU General Public License as published by the Free Software
    21      Foundation; either version 2 of the License, or (at your option) any
    22      later version.
    23  
    24  or both in parallel, as here.
    25  
    26  The GNU MP Library is distributed in the hope that it will be useful, but
    27  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    28  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    29  for more details.
    30  
    31  You should have received copies of the GNU General Public License and the
    32  GNU Lesser General Public License along with the GNU MP Library.  If not,
    33  see https://www.gnu.org/licenses/.  */
    34  
    35  #include <stdarg.h>    /* for va_list and hence doprnt_funs_t */
    36  #include <string.h>
    37  #include <stdio.h>
    38  #include <stdlib.h>
    39  
    40  #include "gmp.h"
    41  #include "gmp-impl.h"
    42  
    43  
    44  int
    45  __gmp_doprnt_integer (const struct doprnt_funs_t *funs,
    46  		      void *data,
    47  		      const struct doprnt_params_t *p,
    48  		      const char *s)
    49  {
    50    int         retval = 0;
    51    int         slen, justlen, showbaselen, sign, signlen, slashlen, zeros;
    52    int         justify, den_showbaselen;
    53    const char  *slash, *showbase;
    54  
    55    /* '+' or ' ' if wanted, and don't already have '-' */
    56    sign = p->sign;
    57    if (s[0] == '-')
    58      {
    59        sign = s[0];
    60        s++;
    61      }
    62    signlen = (sign != '\0');
    63  
    64    /* if the precision was explicitly 0, print nothing for a 0 value */
    65    if (*s == '0' && p->prec == 0)
    66      s++;
    67  
    68    slen = strlen (s);
    69    slash = strchr (s, '/');
    70  
    71    showbase = NULL;
    72    showbaselen = 0;
    73  
    74    if (p->showbase != DOPRNT_SHOWBASE_NO)
    75      {
    76        switch (p->base) {
    77        case 16:  showbase = "0x"; showbaselen = 2; break;
    78        case -16: showbase = "0X"; showbaselen = 2; break;
    79        case 8:   showbase = "0";  showbaselen = 1; break;
    80        }
    81      }
    82  
    83    den_showbaselen = showbaselen;
    84    if (slash == NULL
    85        || (p->showbase == DOPRNT_SHOWBASE_NONZERO && slash[1] == '0'))
    86      den_showbaselen = 0;
    87  
    88    if (p->showbase == DOPRNT_SHOWBASE_NONZERO && s[0] == '0')
    89      showbaselen = 0;
    90  
    91    /* the influence of p->prec on mpq is currently undefined */
    92    zeros = MAX (0, p->prec - slen);
    93  
    94    /* space left over after actual output length */
    95    justlen = p->width
    96      - (strlen(s) + signlen + showbaselen + den_showbaselen + zeros);
    97  
    98    justify = p->justify;
    99    if (justlen <= 0) /* no justifying if exceed width */
   100      justify = DOPRNT_JUSTIFY_NONE;
   101  
   102    if (justify == DOPRNT_JUSTIFY_RIGHT)             /* pad right */
   103      DOPRNT_REPS (p->fill, justlen);
   104  
   105    DOPRNT_REPS_MAYBE (sign, signlen);               /* sign */
   106  
   107    DOPRNT_MEMORY_MAYBE (showbase, showbaselen);     /* base */
   108  
   109    DOPRNT_REPS_MAYBE ('0', zeros);                  /* zeros */
   110  
   111    if (justify == DOPRNT_JUSTIFY_INTERNAL)          /* pad internal */
   112      DOPRNT_REPS (p->fill, justlen);
   113  
   114    /* if there's a showbase on the denominator, then print the numerator
   115       separately so it can be inserted */
   116    if (den_showbaselen != 0)
   117      {
   118        ASSERT (slash != NULL);
   119        slashlen = slash+1 - s;
   120        DOPRNT_MEMORY (s, slashlen);                 /* numerator and slash */
   121        slen -= slashlen;
   122        s += slashlen;
   123        DOPRNT_MEMORY (showbase, den_showbaselen);
   124      }
   125  
   126    DOPRNT_MEMORY (s, slen);                         /* number, or denominator */
   127  
   128    if (justify == DOPRNT_JUSTIFY_LEFT)              /* pad left */
   129      DOPRNT_REPS (p->fill, justlen);
   130  
   131   done:
   132    return retval;
   133  
   134   error:
   135    retval = -1;
   136    goto done;
   137  }