FreeCalypso > hg > freecalypso-sw
annotate gsm-fw/sprintf/vspcore.c @ 218:fee45482aa2a
FFS: hopefully-correct initialization for the FFS_IN_RAM configuration
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Mon, 06 Jan 2014 08:43:35 +0000 |
parents | 4d629b6bbcfd |
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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 core of the vsprintf() function, which may |
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6 * be either used directly by user code or called by the sprintf() |
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7 * trivial wrapper. |
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8 */ |
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9 |
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10 #include <sys/types.h> |
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11 #include <ctype.h> |
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12 #include <stdarg.h> |
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13 #include "defs.h" |
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14 |
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15 extern u_char * _sprintf_integer(u_char *op, int width, int flags, int sign, |
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16 unsigned number, int base, int prec); |
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17 extern u_char * _sprintf_percent_f(u_char *op, int width, int flags, int sign, |
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18 double number, int prec); |
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19 |
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20 u_char * |
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21 _sprintf_field(u_char *op, int width, int flags, int sign, |
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22 u_char *body, int size, int dprec, int fpprec) |
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23 { |
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24 int fieldsz; /* field size expanded by sign, etc */ |
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25 int realsz; /* field size expanded by decimal precision */ |
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26 int n; /* scratch */ |
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27 |
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28 /* |
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29 * All reasonable formats wind up here. At this point, |
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30 * `body' points to a string which (if not flags&LADJUST) |
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31 * should be padded out to `width' places. If |
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32 * flags&ZEROPAD, it should first be prefixed by any |
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33 * sign or other prefix; otherwise, it should be blank |
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34 * padded before the prefix is emitted. After any |
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35 * left-hand padding and prefixing, emit zeroes |
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36 * required by a decimal [diouxX] precision, then print |
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37 * the string proper, then emit zeroes required by any |
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38 * leftover floating precision; finally, if LADJUST, |
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39 * pad with blanks. |
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40 */ |
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41 |
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42 /* |
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43 * compute actual size, so we know how much to pad |
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44 * fieldsz excludes decimal prec; realsz includes it |
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45 */ |
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46 fieldsz = size + fpprec; |
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47 if (sign) |
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48 fieldsz++; |
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49 if (flags & HEXPREFIX) |
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50 fieldsz += 2; |
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51 realsz = dprec > fieldsz ? dprec : fieldsz; |
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52 |
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53 /* right-adjusting blank padding */ |
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54 if ((flags & (LADJUST|ZEROPAD)) == 0 && width) |
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55 for (n = realsz; n < width; n++) |
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56 *op++ = ' '; |
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57 /* prefix */ |
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58 if (sign) |
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59 *op++ = sign; |
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60 if (flags & HEXPREFIX) { |
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61 *op++ = '0'; |
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62 *op++ = (flags & UPPERCASE) ? 'X' : 'x'; |
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63 } |
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64 /* right-adjusting zero padding */ |
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65 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) |
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66 for (n = realsz; n < width; n++) |
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67 *op++ = '0'; |
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68 /* leading zeroes from decimal precision */ |
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69 for (n = fieldsz; n < dprec; n++) |
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70 *op++ = '0'; |
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71 |
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72 /* the string or number proper */ |
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73 bcopy(body, op, size); |
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74 op += size; |
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75 /* trailing f.p. zeroes */ |
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76 while (--fpprec >= 0) |
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77 *op++ = '0'; |
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78 /* left-adjusting padding (always blank) */ |
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79 if (flags & LADJUST) |
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80 for (n = realsz; n < width; n++) |
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81 *op++ = ' '; |
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82 |
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83 return(op); |
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84 } |
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85 |
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86 int |
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87 vsprintf(buf0, fmt0, argp) |
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88 u_char *buf0, *fmt0; |
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89 va_list argp; |
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90 { |
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91 u_char *op; /* output buffer working ptr */ |
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92 u_char *fmt; /* format string working ptr */ |
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93 int ch; /* character from fmt */ |
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94 int n; /* scratch integer */ |
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95 char *t; /* scratch pointer */ |
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96 int flags; /* flags as above */ |
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97 int prec; /* precision from format (%.3d), or -1 */ |
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98 int width; /* width from format (%8d), or 0 */ |
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99 char sign; /* sign prefix (' ', '+', '-', or \0) */ |
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100 unsigned un; /* unsigned number for conversion */ |
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101 |
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102 op = buf0; |
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103 for (fmt = fmt0; ; ++fmt) { |
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104 for (; (ch = *fmt) && ch != '%'; ++fmt) |
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105 *op++ = ch; |
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106 if (!ch) { |
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107 out: *op = '\0'; |
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108 return (op - buf0); |
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109 } |
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parents:
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changeset
|
110 |
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|
111 flags = 0; width = 0; |
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|
112 prec = -1; |
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|
113 sign = '\0'; |
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|
114 |
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|
115 rflag: switch (*++fmt) { |
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|
116 case ' ': |
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|
117 /* |
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|
118 * ``If the space and + flags both appear, the space |
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|
119 * flag will be ignored.'' |
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|
120 * -- ANSI X3J11 |
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|
121 */ |
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|
122 if (!sign) |
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|
123 sign = ' '; |
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parents:
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|
124 goto rflag; |
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parents:
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|
125 case '#': |
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126 flags |= ALT; |
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|
127 goto rflag; |
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|
128 case '*': |
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129 /* |
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130 * ``A negative field width argument is taken as a |
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|
131 * - flag followed by a positive field width.'' |
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132 * -- ANSI X3J11 |
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133 * They don't exclude field widths read from args. |
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|
134 */ |
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|
135 if ((width = va_arg(argp, int)) >= 0) |
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parents:
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|
136 goto rflag; |
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parents:
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|
137 width = -width; |
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|
138 /* FALLTHROUGH */ |
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|
139 case '-': |
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|
140 flags |= LADJUST; |
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parents:
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|
141 goto rflag; |
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parents:
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|
142 case '+': |
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|
143 sign = '+'; |
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parents:
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|
144 goto rflag; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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changeset
|
145 case '.': |
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|
146 if (*++fmt == '*') |
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|
147 n = va_arg(argp, int); |
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|
148 else { |
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|
149 n = 0; |
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|
150 while (isascii(*fmt) && isdigit(*fmt)) |
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parents:
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|
151 n = 10 * n + todigit(*fmt++); |
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parents:
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|
152 --fmt; |
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parents:
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|
153 } |
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|
154 prec = n < 0 ? -1 : n; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
155 goto rflag; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
changeset
|
156 case '0': |
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parents:
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changeset
|
157 /* |
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|
158 * ``Note that 0 is taken as a flag, not as the |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
159 * beginning of a field width.'' |
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parents:
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|
160 * -- ANSI X3J11 |
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parents:
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|
161 */ |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
162 flags |= ZEROPAD; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
163 goto rflag; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
changeset
|
164 case '1': case '2': case '3': case '4': |
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parents:
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|
165 case '5': case '6': case '7': case '8': case '9': |
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parents:
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|
166 n = 0; |
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|
167 do { |
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|
168 n = 10 * n + todigit(*fmt); |
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|
169 } while (isascii(*++fmt) && isdigit(*fmt)); |
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|
170 width = n; |
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|
171 --fmt; |
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parents:
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|
172 goto rflag; |
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parents:
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changeset
|
173 case 'L': |
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|
174 flags |= LONGDBL; |
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parents:
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|
175 goto rflag; |
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parents:
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changeset
|
176 case 'h': |
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|
177 flags |= SHORTINT; |
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parents:
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|
178 goto rflag; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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changeset
|
179 case 'l': |
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parents:
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|
180 flags |= LONGINT; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
181 goto rflag; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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changeset
|
182 case 'c': |
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parents:
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changeset
|
183 /* |
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|
184 * XXX reusing a variable of type char |
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parents:
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|
185 * for an unrelated purpose |
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parents:
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|
186 */ |
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|
187 sign = (char) va_arg(argp, int); |
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|
188 op = _sprintf_field(op, width, flags, 0, &sign, 1, |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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changeset
|
189 0, 0); |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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changeset
|
190 break; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
changeset
|
191 case 'D': |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
192 flags |= LONGINT; |
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parents:
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|
193 /*FALLTHROUGH*/ |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
194 case 'd': |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
195 case 'i': |
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parents:
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|
196 n = va_arg(argp, int); |
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parents:
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|
197 if (n < 0) { |
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parents:
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|
198 un = -n; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
199 sign = '-'; |
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parents:
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|
200 } else |
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parents:
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|
201 un = n; |
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parents:
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|
202 op = _sprintf_integer(op, width, flags, sign, un, 10, |
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parents:
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|
203 prec); |
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parents:
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changeset
|
204 break; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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changeset
|
205 case 'f': |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
206 op = _sprintf_percent_f(op, width, flags, sign, |
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|
207 va_arg(argp, double), prec); |
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parents:
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|
208 break; |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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|
209 case 'n': |
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|
210 n = op - buf0; |
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|
211 if (flags & LONGINT) |
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|
212 *va_arg(argp, long *) = n; |
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|
213 else if (flags & SHORTINT) |
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|
214 *va_arg(argp, short *) = n; |
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|
215 else |
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|
216 *va_arg(argp, int *) = n; |
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parents:
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|
217 break; |
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parents:
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|
218 case 'O': |
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|
219 flags |= LONGINT; |
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|
220 /*FALLTHROUGH*/ |
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parents:
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|
221 case 'o': |
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|
222 un = va_arg(argp, unsigned); |
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|
223 op = _sprintf_integer(op, width, flags, 0, un, 8, prec); |
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parents:
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224 break; |
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225 case 'p': |
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226 /* |
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227 * ``The argument shall be a pointer to void. The |
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228 * value of the pointer is converted to a sequence |
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229 * of printable characters, in an implementation- |
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230 * defined manner.'' |
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231 * -- ANSI X3J11 |
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232 */ |
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233 /* NOSTRICT */ |
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234 un = (unsigned)va_arg(argp, void *); |
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235 op = _sprintf_integer(op, width, flags | HEXPREFIX, 0, |
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236 un, 16, prec); |
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237 break; |
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238 case 's': |
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239 if (!(t = va_arg(argp, char *))) |
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240 t = "(null)"; |
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241 if (prec >= 0) { |
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242 /* |
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243 * can't use strlen; can only look for the |
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244 * NUL in the first `prec' characters, and |
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245 * strlen() will go further. |
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246 */ |
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247 char *p, *memchr(); |
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248 |
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249 if (p = memchr(t, 0, prec)) { |
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250 n = p - t; |
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251 if (n > prec) |
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252 n = prec; |
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253 } else |
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254 n = prec; |
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255 } else |
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256 n = strlen(t); |
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257 op = _sprintf_field(op, width, flags, 0, t, n, 0, 0); |
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258 break; |
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259 case 'U': |
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260 flags |= LONGINT; |
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261 /*FALLTHROUGH*/ |
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262 case 'u': |
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263 un = va_arg(argp, unsigned); |
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264 op = _sprintf_integer(op, width, flags, 0, un, 10, |
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265 prec); |
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266 break; |
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267 case 'X': |
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268 flags |= UPPERCASE; |
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269 /* FALLTHROUGH */ |
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270 case 'x': |
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271 un = va_arg(argp, unsigned); |
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272 /* leading 0x/X only if non-zero */ |
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273 if (flags & ALT && un != 0) |
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274 flags |= HEXPREFIX; |
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275 op = _sprintf_integer(op, width, flags, 0, un, 16, |
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276 prec); |
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277 break; |
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278 case '\0': /* "%?" prints ?, unless ? is NULL */ |
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279 goto out; |
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280 default: |
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281 *op++ = *fmt; |
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282 } |
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283 } |
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284 /* NOTREACHED */ |
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285 } |