FreeCalypso > hg > freecalypso-sw

annotate gsm-fw/sprintf/float.c @ 923:10b4bed10192

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gsm-fw/L1: fix for the DSP patch corruption bug The L1 code we got from the LoCosto fw contains a feature for DSP CPU load measurement. This feature is a LoCosto-ism, i.e., not applicable to earlier DBB chips (Calypso) with their respective earlier DSP ROMs. Most of the code dealing with that feature is conditionalized as #if (DSP >= 38), but one spot was missed, and the MCU code was writing into an API word dealing with this feature. In TCS211 this DSP API word happens to be used by the DSP code patch, hence that write was corrupting the patched DSP code.
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Mon, 19 Oct 2015 17:13:56 +0000
parents 4ac657b95f52
children
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1 /*
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2 * Embedded [v]sprintf() implementation by Michael Spacefalcon,
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3 * loosely based on the 4.3BSD-Tahoe version.
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4 *
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5 * This module contains the floating point conversion functions.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <ctype.h>
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10 #include "defs.h"
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11
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12 extern double modf();
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13
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14 extern u_char * _sprintf_field(u_char *op, int width, int flags, int sign,
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15 u_char *body, int size, int dprec, int fpprec);
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16
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17 #define MAX_INT_DIGITS 10 /* 2^32-1 in decimal */
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18 #define MAXFRACT 16 /* max sensible for 64-bit double */
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19 #define DEFPREC 6
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20
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21 static char *
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22 emit_integer_portion(unsigned number, char *endp)
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23 {
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24 char *t = endp;
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25
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26 do {
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27 *--t = tochar(number % 10);
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28 number /= 10;
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29 } while (number);
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30 return (t);
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31 }
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32
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33 static int
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34 f_round(double fract, char *start, char *end, int sign)
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35 {
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36 double tmp;
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37
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38 (void)modf(fract * 10, &tmp);
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39 if (tmp > 4)
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40 for (;; --end) {
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41 if (*end == '.')
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42 --end;
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43 if (++*end <= '9')
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44 break;
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45 *end = '0';
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46 }
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47 /* ``"%.3f", (double)-0.0004'' gives you a negative 0. */
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48 else if (sign == '-')
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49 for (;; --end) {
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50 if (*end == '.')
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51 --end;
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52 if (*end != '0')
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53 break;
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54 if (end == start)
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55 return(1); /* clear the -ve */
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56 }
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57 return(0);
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58 }
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59
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60 u_char *
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61 _sprintf_percent_f(u_char *op, int width, int flags, int sign,
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62 double number, int prec)
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63 {
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64 char buf[MAX_INT_DIGITS + 1 + MAXFRACT];
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65 int extra_prec = 0;
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66 int origsign = sign;
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67 double fract, tmp;
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68 char *start, *t;
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69
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70 /* first order of business: weed out infinities and NaNs */
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71 if (isinf(number)) {
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72 if (number < 0)
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73 sign = '-';
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74 return _sprintf_field(op, width, flags, sign, "Inf", 3, 0, 0);
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75 }
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76 if (isnan(number))
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77 return _sprintf_field(op, width, flags, sign, "NaN", 3, 0, 0);
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78 /* OK, we know it's a valid real like in the good old VAX days */
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79 if (number < 0) {
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80 sign = '-';
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81 number = -number;
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82 }
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83 fract = modf(number, &tmp);
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84 if (tmp > (double) 0xFFFFFFFF)
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85 return _sprintf_field(op, width, flags, sign, "Toobig", 6,
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86 0, 0);
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87 start = emit_integer_portion((unsigned) tmp, buf + MAX_INT_DIGITS);
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88 if (prec > MAXFRACT) {
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89 extra_prec = prec - MAXFRACT;
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90 prec = MAXFRACT;
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91 } else if (prec == -1)
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92 prec = DEFPREC;
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93 t = buf + MAX_INT_DIGITS;
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94 /*
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95 * if precision required or alternate flag set, add in a
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96 * decimal point.
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97 */
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98 if (prec || flags&ALT)
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99 *t++ = '.';
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100 /* if requires more precision and some fraction left */
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101 if (fract) {
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102 if (prec)
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103 do {
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104 fract = modf(fract * 10, &tmp);
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105 *t++ = tochar((int)tmp);
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106 } while (--prec && fract);
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107 if (fract && f_round(fract, start, t - 1, sign))
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108 sign = origsign;
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109 }
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110 return _sprintf_field(op, width, flags, sign, start, t - start,
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111 0, prec + extra_prec);
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112 }