src/compat/snprintf.c File Reference

#include "main.h"
#include "snprintf.h"
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <varargs.h>
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Go to the source code of this file.

Defines

#define VA_LOCAL_DECL   va_list ap
#define VA_START(f)   va_start(ap)
#define VA_SHIFT(v, t)   v = va_arg(ap,t)
#define VA_END   va_end(ap)
#define LDOUBLE   double
#define DP_S_DEFAULT   0
#define DP_S_FLAGS   1
#define DP_S_MIN   2
#define DP_S_DOT   3
#define DP_S_MAX   4
#define DP_S_MOD   5
#define DP_S_CONV   6
#define DP_S_DONE   7
#define DP_F_MINUS   (1 << 0)
#define DP_F_PLUS   (1 << 1)
#define DP_F_SPACE   (1 << 2)
#define DP_F_NUM   (1 << 3)
#define DP_F_ZERO   (1 << 4)
#define DP_F_UP   (1 << 5)
#define DP_F_UNSIGNED   (1 << 6)
#define DP_C_SHORT   1
#define DP_C_LONG   2
#define DP_C_LDOUBLE   3
#define char_to_int(p)   (p - '0')
#define MAX(p, q)   ((p >= q) ? p : q)

Functions

static void dopr (char *buffer, size_t maxlen, const char *format, va_list args)
static void fmtstr (char *buffer, size_t *currlen, size_t maxlen, char *value, int flags, int min, int max)
static void fmtint (char *buffer, size_t *currlen, size_t maxlen, long value, int base, int min, int max, int flags)
static void fmtfp (char *buffer, size_t *currlen, size_t maxlen, double fvalue, int min, int max, int flags)
static void dopr_outch (char *buffer, size_t *currlen, size_t maxlen, char c)
static double abs_val (double value)
static double pow10 (int exp)
static long round (double value)
int egg_vsnprintf (char *str, size_t count, const char *fmt, va_list args)
int egg_snprintf (va_alist)

Define Documentation

#define char_to_int ( p   )     (p - '0')

Definition at line 154 of file snprintf.c.

Referenced by dopr().

#define DP_C_LDOUBLE   3

Definition at line 152 of file snprintf.c.

Referenced by dopr().

#define DP_C_LONG   2

Definition at line 151 of file snprintf.c.

Referenced by dopr().

#define DP_C_SHORT   1

Definition at line 150 of file snprintf.c.

Referenced by dopr().

#define DP_F_MINUS   (1 << 0)

Definition at line 141 of file snprintf.c.

Referenced by dopr(), fmtfp(), fmtint(), and fmtstr().

#define DP_F_NUM   (1 << 3)

Definition at line 144 of file snprintf.c.

Referenced by dopr().

#define DP_F_PLUS   (1 << 1)

Definition at line 142 of file snprintf.c.

Referenced by dopr(), fmtfp(), and fmtint().

#define DP_F_SPACE   (1 << 2)

Definition at line 143 of file snprintf.c.

Referenced by dopr(), fmtfp(), and fmtint().

#define DP_F_UNSIGNED   (1 << 6)

Definition at line 147 of file snprintf.c.

Referenced by dopr(), and fmtint().

#define DP_F_UP   (1 << 5)

Definition at line 146 of file snprintf.c.

Referenced by dopr(), fmtfp(), and fmtint().

#define DP_F_ZERO   (1 << 4)

Definition at line 145 of file snprintf.c.

Referenced by dopr(), fmtfp(), and fmtint().

#define DP_S_CONV   6

Definition at line 137 of file snprintf.c.

Referenced by dopr().

#define DP_S_DEFAULT   0

Definition at line 131 of file snprintf.c.

Referenced by dopr().

#define DP_S_DONE   7

Definition at line 138 of file snprintf.c.

Referenced by dopr().

#define DP_S_DOT   3

Definition at line 134 of file snprintf.c.

Referenced by dopr().

#define DP_S_FLAGS   1

Definition at line 132 of file snprintf.c.

Referenced by dopr().

#define DP_S_MAX   4

Definition at line 135 of file snprintf.c.

Referenced by dopr().

#define DP_S_MIN   2

Definition at line 133 of file snprintf.c.

Referenced by dopr().

#define DP_S_MOD   5

Definition at line 136 of file snprintf.c.

Referenced by dopr().

#define LDOUBLE   double

Definition at line 114 of file snprintf.c.

Referenced by abs_val(), dopr(), fmtfp(), and pow10().

#define MAX ( p,
q   )     ((p >= q) ? p : q)

Definition at line 159 of file snprintf.c.

Referenced by fmtint().

#define VA_END   va_end(ap)

Definition at line 108 of file snprintf.c.

Referenced by egg_snprintf().

#define VA_LOCAL_DECL   va_list ap

Definition at line 105 of file snprintf.c.

Referenced by egg_snprintf().

#define VA_SHIFT ( v,
t   )     v = va_arg(ap,t)

Definition at line 107 of file snprintf.c.

Referenced by egg_snprintf().

#define VA_START ( f   )     va_start(ap)

Definition at line 106 of file snprintf.c.

Referenced by egg_snprintf().

Function Documentation

static double abs_val ( double  value  )  [static]

Definition at line 539 of file snprintf.c.

References LDOUBLE.

Referenced by fmtfp().

00540 {
00541   LDOUBLE result = value;
00542 
00543   if (value < 0)
00544     result = -value;
00545 
00546   return result;
00547 }

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static void dopr ( char *  buffer,
size_t  maxlen,
const char *  format,
va_list  args 
) [static]

Definition at line 161 of file snprintf.c.

References char_to_int, dopr_outch(), DP_C_LDOUBLE, DP_C_LONG, DP_C_SHORT, DP_F_MINUS, DP_F_NUM, DP_F_PLUS, DP_F_SPACE, DP_F_UNSIGNED, DP_F_UP, DP_F_ZERO, DP_S_CONV, DP_S_DEFAULT, DP_S_DONE, DP_S_DOT, DP_S_FLAGS, DP_S_MAX, DP_S_MIN, DP_S_MOD, egg_isdigit, fmtfp(), fmtint(), fmtstr(), and LDOUBLE.

Referenced by egg_vsnprintf().

00162 {
00163   char ch;
00164   long value;
00165   LDOUBLE fvalue;
00166   char *strvalue;
00167   int min;
00168   int max;
00169   int state;
00170   int flags;
00171   int cflags;
00172   size_t currlen;
00173 
00174   state = DP_S_DEFAULT;
00175   currlen = flags = cflags = min = 0;
00176   max = -1;
00177   ch = *format++;
00178 
00179   while (state != DP_S_DONE) {
00180     if ((ch == '\0') || (currlen >= maxlen))
00181       state = DP_S_DONE;
00182 
00183     switch (state) {
00184     case DP_S_DEFAULT:
00185       if (ch == '%')
00186         state = DP_S_FLAGS;
00187       else
00188         dopr_outch(buffer, &currlen, maxlen, ch);
00189       ch = *format++;
00190       break;
00191     case DP_S_FLAGS:
00192       switch (ch) {
00193       case '-':
00194         flags |= DP_F_MINUS;
00195         ch = *format++;
00196         break;
00197       case '+':
00198         flags |= DP_F_PLUS;
00199         ch = *format++;
00200         break;
00201       case ' ':
00202         flags |= DP_F_SPACE;
00203         ch = *format++;
00204         break;
00205       case '#':
00206         flags |= DP_F_NUM;
00207         ch = *format++;
00208         break;
00209       case '0':
00210         flags |= DP_F_ZERO;
00211         ch = *format++;
00212         break;
00213       default:
00214         state = DP_S_MIN;
00215         break;
00216       }
00217       break;
00218     case DP_S_MIN:
00219       if (egg_isdigit(ch)) {
00220         min = 10 * min + char_to_int(ch);
00221         ch = *format++;
00222       } else if (ch == '*') {
00223         min = va_arg(args, int);
00224 
00225         ch = *format++;
00226         state = DP_S_DOT;
00227       } else
00228         state = DP_S_DOT;
00229       break;
00230     case DP_S_DOT:
00231       if (ch == '.') {
00232         state = DP_S_MAX;
00233         ch = *format++;
00234       } else
00235         state = DP_S_MOD;
00236       break;
00237     case DP_S_MAX:
00238       if (egg_isdigit(ch)) {
00239         if (max < 0)
00240           max = 0;
00241         max = 10 * max + char_to_int(ch);
00242         ch = *format++;
00243       } else if (ch == '*') {
00244         max = va_arg(args, int);
00245 
00246         ch = *format++;
00247         state = DP_S_MOD;
00248       } else
00249         state = DP_S_MOD;
00250       break;
00251     case DP_S_MOD:
00252       /* Currently, we don't support Long Long, bummer */
00253       switch (ch) {
00254       case 'h':
00255         cflags = DP_C_SHORT;
00256         ch = *format++;
00257         break;
00258       case 'l':
00259         cflags = DP_C_LONG;
00260         ch = *format++;
00261         break;
00262       case 'L':
00263         cflags = DP_C_LDOUBLE;
00264         ch = *format++;
00265         break;
00266       default:
00267         break;
00268       }
00269       state = DP_S_CONV;
00270       break;
00271     case DP_S_CONV:
00272       switch (ch) {
00273       case 'd':
00274       case 'i':
00275         if (cflags == DP_C_SHORT)
00276           value = va_arg(args, int);
00277 
00278         else if (cflags == DP_C_LONG)
00279           value = va_arg(args, long int);
00280 
00281         else
00282           value = va_arg(args, int);
00283 
00284         fmtint(buffer, &currlen, maxlen, value, 10, min, max, flags);
00285         break;
00286       case 'o':
00287         flags |= DP_F_UNSIGNED;
00288         if (cflags == DP_C_SHORT)
00289           value = va_arg(args, unsigned int);
00290 
00291         else if (cflags == DP_C_LONG)
00292           value = va_arg(args, unsigned long int);
00293 
00294         else
00295           value = va_arg(args, unsigned int);
00296 
00297         fmtint(buffer, &currlen, maxlen, value, 8, min, max, flags);
00298         break;
00299       case 'u':
00300         flags |= DP_F_UNSIGNED;
00301         if (cflags == DP_C_SHORT)
00302           value = va_arg(args, unsigned int);
00303 
00304         else if (cflags == DP_C_LONG)
00305           value = va_arg(args, unsigned long int);
00306 
00307         else
00308           value = va_arg(args, unsigned int);
00309 
00310         fmtint(buffer, &currlen, maxlen, value, 10, min, max, flags);
00311         break;
00312       case 'X':
00313         flags |= DP_F_UP;
00314       case 'x':
00315         flags |= DP_F_UNSIGNED;
00316         if (cflags == DP_C_SHORT)
00317           value = va_arg(args, unsigned int);
00318 
00319         else if (cflags == DP_C_LONG)
00320           value = va_arg(args, unsigned long int);
00321 
00322         else
00323           value = va_arg(args, unsigned int);
00324 
00325         fmtint(buffer, &currlen, maxlen, value, 16, min, max, flags);
00326         break;
00327       case 'f':
00328         if (cflags == DP_C_LDOUBLE)
00329           fvalue = va_arg(args, LDOUBLE);
00330         else
00331           fvalue = va_arg(args, double);
00332 
00333         /* um, floating point? */
00334         fmtfp(buffer, &currlen, maxlen, fvalue, min, max, flags);
00335         break;
00336       case 'E':
00337         flags |= DP_F_UP;
00338       case 'e':
00339         if (cflags == DP_C_LDOUBLE)
00340           fvalue = va_arg(args, LDOUBLE);
00341         else
00342           fvalue = va_arg(args, double);
00343 
00344         break;
00345       case 'G':
00346         flags |= DP_F_UP;
00347       case 'g':
00348         if (cflags == DP_C_LDOUBLE)
00349           fvalue = va_arg(args, LDOUBLE);
00350         else
00351           fvalue = va_arg(args, double);
00352 
00353         break;
00354       case 'c':
00355         dopr_outch(buffer, &currlen, maxlen, va_arg(args, int));
00356 
00357         break;
00358       case 's':
00359         strvalue = va_arg(args, char *);
00360 
00361         if (max < 0)
00362           max = maxlen;         /* ie, no max */
00363         fmtstr(buffer, &currlen, maxlen, strvalue, flags, min, max);
00364         break;
00365       case 'p':
00366         strvalue = va_arg(args, void *);
00367 
00368         fmtint(buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
00369         break;
00370       case 'n':
00371         if (cflags == DP_C_SHORT) {
00372           short int *num;
00373           num = va_arg(args, short int *);
00374 
00375           *num = currlen;
00376         } else if (cflags == DP_C_LONG) {
00377           long int *num;
00378           num = va_arg(args, long int *);
00379 
00380           *num = currlen;
00381         } else {
00382           int *num;
00383           num = va_arg(args, int *);
00384 
00385           *num = currlen;
00386         }
00387         break;
00388       case '%':
00389         dopr_outch(buffer, &currlen, maxlen, ch);
00390         break;
00391       case 'w':
00392         /* not supported yet, treat as next char */
00393         ch = *format++;
00394         break;
00395       default:
00396         /* Unknown, skip */
00397         break;
00398       }
00399       ch = *format++;
00400       state = DP_S_DEFAULT;
00401       flags = cflags = min = 0;
00402       max = -1;
00403       break;
00404     case DP_S_DONE:
00405       break;
00406     default:
00407       /* hmm? */
00408       break;                    /* some picky compilers need this */
00409     }
00410   }
00411   if (currlen < maxlen - 1)
00412     buffer[currlen] = '\0';
00413   else
00414     buffer[maxlen - 1] = '\0';
00415 }

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static void dopr_outch ( char *  buffer,
size_t *  currlen,
size_t  maxlen,
char  c 
) [static]

Definition at line 703 of file snprintf.c.

Referenced by dopr(), fmtfp(), fmtint(), and fmtstr().

00704 {
00705   if (*currlen < maxlen)
00706     buffer[(*currlen)++] = c;
00707 }

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int egg_snprintf ( va_alist   ) 

Definition at line 721 of file snprintf.c.

References egg_vsnprintf, VA_END, VA_LOCAL_DECL, VA_SHIFT, VA_START, and void().

00724 {
00725 #  ifndef HAVE_STDARGS
00726   char *str;
00727   size_t count;
00728   char *fmt;
00729 #  endif
00730   VA_LOCAL_DECL;
00731 
00732   VA_START(fmt);
00733   VA_SHIFT(str, char *);
00734 
00735   VA_SHIFT(count, size_t);
00736   VA_SHIFT(fmt, char *);
00737 
00738   (void) egg_vsnprintf(str, count, fmt, ap);
00739   VA_END;
00740   return (strlen(str));
00741 }

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int egg_vsnprintf ( char *  str,
size_t  count,
const char *  fmt,
va_list  args 
)

Definition at line 709 of file snprintf.c.

References dopr().

00710 {
00711   str[0] = 0;
00712   dopr(str, count, fmt, args);
00713   return (strlen(str));
00714 }

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static void fmtfp ( char *  buffer,
size_t *  currlen,
size_t  maxlen,
double  fvalue,
int  min,
int  max,
int  flags 
) [static]

Definition at line 573 of file snprintf.c.

References abs_val(), dopr_outch(), DP_F_MINUS, DP_F_PLUS, DP_F_SPACE, DP_F_UP, DP_F_ZERO, LDOUBLE, pow10(), and round().

Referenced by dopr().

00575 {
00576   int signvalue = 0;
00577   LDOUBLE ufvalue;
00578   char iconvert[20];
00579   char fconvert[20];
00580   int iplace = 0;
00581   int fplace = 0;
00582   int padlen = 0;               /* amount to pad */
00583   int zpadlen = 0;
00584   int caps = 0;
00585   long intpart;
00586   long fracpart;
00587 
00588   /*
00589    * AIX manpage says the default is 0, but Solaris says the default
00590    * is 6, and sprintf on AIX defaults to 6
00591    */
00592   if (max < 0)
00593     max = 6;
00594 
00595   ufvalue = abs_val(fvalue);
00596 
00597   if (fvalue < 0)
00598     signvalue = '-';
00599   else if (flags & DP_F_PLUS)   /* Do a sign (+/i) */
00600     signvalue = '+';
00601   else if (flags & DP_F_SPACE)
00602     signvalue = ' ';
00603 
00604 #if 0
00605   if (flags & DP_F_UP)
00606     caps = 1;                   /* Should characters be upper case? */
00607 #endif
00608 
00609   intpart = ufvalue;
00610 
00611   /*
00612    * Sorry, we only support 9 digits past the decimal because of our
00613    * conversion method
00614    */
00615   if (max > 9)
00616     max = 9;
00617 
00618   /* We "cheat" by converting the fractional part to integer by
00619    * multiplying by a factor of 10
00620    */
00621   fracpart = round((pow10(max)) * (ufvalue - intpart));
00622 
00623   if (fracpart >= pow10(max)) {
00624     intpart++;
00625     fracpart -= pow10(max);
00626   }
00627 
00628   /* Convert integer part */
00629   do {
00630     iconvert[iplace++] =
00631       (caps ? "0123456789ABCDEF" : "0123456789abcdef")[intpart % 10];
00632     intpart = (intpart / 10);
00633   }
00634   while (intpart && (iplace < 20));
00635   if (iplace == 20)
00636     iplace--;
00637   iconvert[iplace] = 0;
00638 
00639   /* Convert fractional part */
00640   do {
00641     fconvert[fplace++] =
00642       (caps ? "0123456789ABCDEF" : "0123456789abcdef")[fracpart % 10];
00643     fracpart = (fracpart / 10);
00644   }
00645   while (fracpart && (fplace < 20));
00646   if (fplace == 20)
00647     fplace--;
00648   fconvert[fplace] = 0;
00649 
00650   /* -1 for decimal point, another -1 if we are printing a sign */
00651   padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
00652   zpadlen = max - fplace;
00653   if (zpadlen < 0)
00654     zpadlen = 0;
00655   if (padlen < 0)
00656     padlen = 0;
00657   if (flags & DP_F_MINUS)
00658     padlen = -padlen;           /* Left Justifty */
00659 
00660   if ((flags & DP_F_ZERO) && (padlen > 0)) {
00661     if (signvalue) {
00662       dopr_outch(buffer, currlen, maxlen, signvalue);
00663       --padlen;
00664       signvalue = 0;
00665     }
00666     while (padlen > 0) {
00667       dopr_outch(buffer, currlen, maxlen, '0');
00668       --padlen;
00669     }
00670   }
00671   while (padlen > 0) {
00672     dopr_outch(buffer, currlen, maxlen, ' ');
00673     --padlen;
00674   }
00675   if (signvalue)
00676     dopr_outch(buffer, currlen, maxlen, signvalue);
00677 
00678   while (iplace > 0)
00679     dopr_outch(buffer, currlen, maxlen, iconvert[--iplace]);
00680 
00681   /*
00682    * Decimal point.  This should probably use locale to find the correct
00683    * char to print out.
00684    */
00685   if (max > 0) {
00686     dopr_outch(buffer, currlen, maxlen, '.');
00687 
00688     while (fplace > 0)
00689       dopr_outch(buffer, currlen, maxlen, fconvert[--fplace]);
00690   }
00691 
00692   while (zpadlen > 0) {
00693     dopr_outch(buffer, currlen, maxlen, '0');
00694     --zpadlen;
00695   }
00696 
00697   while (padlen < 0) {
00698     dopr_outch(buffer, currlen, maxlen, ' ');
00699     ++padlen;
00700   }
00701 }

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static void fmtint ( char *  buffer,
size_t *  currlen,
size_t  maxlen,
long  value,
int  base,
int  min,
int  max,
int  flags 
) [static]

Definition at line 452 of file snprintf.c.

References dopr_outch(), DP_F_MINUS, DP_F_PLUS, DP_F_SPACE, DP_F_UNSIGNED, DP_F_UP, DP_F_ZERO, and MAX.

Referenced by dopr().

00454 {
00455   int signvalue = 0;
00456   unsigned long uvalue;
00457   char convert[20];
00458   int place = 0;
00459   int spadlen = 0;              /* amount to space pad */
00460   int zpadlen = 0;              /* amount to zero pad */
00461   int caps = 0;
00462 
00463   if (max < 0)
00464     max = 0;
00465 
00466   uvalue = value;
00467 
00468   if (!(flags & DP_F_UNSIGNED)) {
00469     if (value < 0) {
00470       signvalue = '-';
00471       uvalue = -value;
00472     } else if (flags & DP_F_PLUS) /* Do a sign (+/i) */
00473       signvalue = '+';
00474     else if (flags & DP_F_SPACE)
00475       signvalue = ' ';
00476   }
00477 
00478   if (flags & DP_F_UP)
00479     caps = 1;                   /* Should characters be upper case? */
00480 
00481   do {
00482     convert[place++] = (caps ? "0123456789ABCDEF" : "0123456789abcdef")
00483       [uvalue % (unsigned) base];
00484     uvalue = (uvalue / (unsigned) base);
00485   }
00486   while (uvalue && (place < 20));
00487   if (place == 20)
00488     place--;
00489   convert[place] = 0;
00490 
00491   zpadlen = max - place;
00492   spadlen = min - MAX(max, place) - (signvalue ? 1 : 0);
00493   if (zpadlen < 0)
00494     zpadlen = 0;
00495   if (spadlen < 0)
00496     spadlen = 0;
00497   if (flags & DP_F_ZERO) {
00498     zpadlen = MAX(zpadlen, spadlen);
00499     spadlen = 0;
00500   }
00501   if (flags & DP_F_MINUS)
00502     spadlen = -spadlen;         /* Left Justifty */
00503 
00504 #ifdef DEBUG_SNPRINTF
00505   dprint(1,
00506          (debugfile, "zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
00507           zpadlen, spadlen, min, max, place));
00508 #endif
00509 
00510   /* Spaces */
00511   while (spadlen > 0) {
00512     dopr_outch(buffer, currlen, maxlen, ' ');
00513     --spadlen;
00514   }
00515 
00516   /* Sign */
00517   if (signvalue)
00518     dopr_outch(buffer, currlen, maxlen, signvalue);
00519 
00520   /* Zeros */
00521   if (zpadlen > 0) {
00522     while (zpadlen > 0) {
00523       dopr_outch(buffer, currlen, maxlen, '0');
00524       --zpadlen;
00525     }
00526   }
00527 
00528   /* Digits */
00529   while (place > 0)
00530     dopr_outch(buffer, currlen, maxlen, convert[--place]);
00531 
00532   /* Left Justified spaces */
00533   while (spadlen < 0) {
00534     dopr_outch(buffer, currlen, maxlen, ' ');
00535     ++spadlen;
00536   }
00537 }

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static void fmtstr ( char *  buffer,
size_t *  currlen,
size_t  maxlen,
char *  value,
int  flags,
int  min,
int  max 
) [static]

Definition at line 417 of file snprintf.c.

References dopr_outch(), and DP_F_MINUS.

Referenced by dopr().

00419 {
00420   int padlen, strln;            /* amount to pad */
00421   int cnt = 0;
00422 
00423   if (value == 0) {
00424     value = "<NULL>";
00425   }
00426 
00427   for (strln = 0; value[strln]; ++strln);       /* strlen */
00428   padlen = min - strln;
00429   if (padlen < 0)
00430     padlen = 0;
00431   if (flags & DP_F_MINUS)
00432     padlen = -padlen;           /* Left Justify */
00433 
00434   while ((padlen > 0) && (cnt < max)) {
00435     dopr_outch(buffer, currlen, maxlen, ' ');
00436     --padlen;
00437     ++cnt;
00438   }
00439   while (*value && (cnt < max)) {
00440     dopr_outch(buffer, currlen, maxlen, *value++);
00441     ++cnt;
00442   }
00443   while ((padlen < 0) && (cnt < max)) {
00444     dopr_outch(buffer, currlen, maxlen, ' ');
00445     ++padlen;
00446     ++cnt;
00447   }
00448 }

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static double pow10 ( int  exp  )  [static]

Definition at line 549 of file snprintf.c.

References LDOUBLE.

Referenced by fmtfp().

00550 {
00551   LDOUBLE result = 1;
00552 
00553   while (exp) {
00554     result *= 10;
00555     exp--;
00556   }
00557 
00558   return result;
00559 }

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static long round ( double  value  )  [static]

Definition at line 561 of file snprintf.c.

Referenced by fmtfp().

00562 {
00563   long intpart;
00564 
00565   intpart = value;
00566   value = value - intpart;
00567   if (value >= 0.5)
00568     intpart++;
00569 
00570   return intpart;
00571 }

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Generated on 7 Sep 2016 for Eggdrop by  doxygen 1.6.1