7 /* These can be removed once integrated into PDCLIB make procedure */
9 #include </home/solar/src/pdclib/functions/_PDCLIB/digits.c>
10 #include </home/solar/src/pdclib/functions/_PDCLIB/Xdigits.c>
12 /* Using an integer's bits as flags for both the conversion flags and length
25 #define E_intmax 1<<10
27 #define E_ptrdiff 1<<12
28 #define E_intptr 1<<13
29 #define E_double 1<<14
31 #define E_unsigned 1<<16
35 int base; /* base to which the value shall be converted */
36 int_fast32_t flags; /* flags and length modifiers */
37 size_t n; /* maximum number of characters to be written */
38 size_t i; /* number of characters already written */
39 size_t this; /* number of output chars in the current conversion */
40 char * s; /* target buffer */
41 size_t width; /* width of current field */
42 size_t prec; /* precision of current field */
43 FILE * stream;/* for to-stream output */
44 va_list ap; /* the argument stack passed to the printf function */
47 const char * parse_out( const char * spec, struct status_t * status );
48 inline void test( size_t n, const char * expect, ... );
49 int _PDCLIB_sprintf( char * buffer, size_t n, const char * format, va_list ap );
51 /* The following only for testing. */
57 test( SIZE_MAX, "%hhd", CHAR_MIN );
58 test( SIZE_MAX, "%hhd", CHAR_MAX );
59 test( SIZE_MAX, "%hhd", 0 );
60 test( SIZE_MAX, "%hd", SHRT_MIN );
61 test( SIZE_MAX, "%hd", SHRT_MAX );
62 test( SIZE_MAX, "%hd", 0 );
63 test( SIZE_MAX, "%d", INT_MIN );
64 test( SIZE_MAX, "%d", INT_MAX );
65 test( SIZE_MAX, "%d", 0 );
66 test( SIZE_MAX, "%ld", LONG_MIN );
67 test( SIZE_MAX, "%ld", LONG_MAX );
68 test( SIZE_MAX, "%ld", 0l );
69 test( SIZE_MAX, "%lld", LLONG_MIN );
70 test( SIZE_MAX, "%lld", LLONG_MAX );
71 test( SIZE_MAX, "%lld", 0ll );
72 test( SIZE_MAX, "%hhu", UCHAR_MAX );
73 test( SIZE_MAX, "%hhu", (unsigned char)-1 );
74 test( SIZE_MAX, "%hu", USHRT_MAX );
75 test( SIZE_MAX, "%hu", (unsigned short)-1 );
76 test( SIZE_MAX, "%u", UINT_MAX );
77 test( SIZE_MAX, "%u", -1u );
78 test( SIZE_MAX, "%lu", ULONG_MAX );
79 test( SIZE_MAX, "%lu", -1ul );
80 test( SIZE_MAX, "%llu", ULLONG_MAX );
81 test( SIZE_MAX, "%llu", -1ull );
82 test( SIZE_MAX, "%X", UINT_MAX );
83 test( SIZE_MAX, "%#X", -1u );
84 test( SIZE_MAX, "%x", UINT_MAX );
85 test( SIZE_MAX, "%#x", -1u );
86 test( SIZE_MAX, "%o", UINT_MAX );
87 test( SIZE_MAX, "%#o", -1u );
88 test( SIZE_MAX, "%.0#o", 0 );
89 test( SIZE_MAX, "%+d", INT_MIN );
90 test( SIZE_MAX, "%+d", INT_MAX );
91 test( SIZE_MAX, "%+d", 0 );
92 test( SIZE_MAX, "%+u", UINT_MAX );
93 test( SIZE_MAX, "%+u", -1u );
94 test( SIZE_MAX, "% d", INT_MIN );
95 test( SIZE_MAX, "% d", INT_MAX );
96 test( SIZE_MAX, "% d", 0 );
97 test( SIZE_MAX, "% u", UINT_MAX );
98 test( SIZE_MAX, "% u", -1u );
99 test( SIZE_MAX, "%9d", INT_MIN );
100 test( SIZE_MAX, "%9d", INT_MAX );
101 test( SIZE_MAX, "%10d", INT_MIN );
102 test( SIZE_MAX, "%10d", INT_MAX );
103 test( SIZE_MAX, "%11d", INT_MIN );
104 test( SIZE_MAX, "%11d", INT_MAX );
105 test( SIZE_MAX, "%12d", INT_MIN );
106 test( SIZE_MAX, "%12d", INT_MAX );
107 test( SIZE_MAX, "%-9d", INT_MIN );
108 test( SIZE_MAX, "%-9d", INT_MAX );
109 test( SIZE_MAX, "%-10d", INT_MIN );
110 test( SIZE_MAX, "%-10d", INT_MAX );
111 test( SIZE_MAX, "%-11d", INT_MIN );
112 test( SIZE_MAX, "%-11d", INT_MAX );
113 test( SIZE_MAX, "%-12d", INT_MIN );
114 test( SIZE_MAX, "%-12d", INT_MAX );
115 test( SIZE_MAX, "%09d", INT_MIN );
116 test( SIZE_MAX, "%09d", INT_MAX );
117 test( SIZE_MAX, "%010d", INT_MIN );
118 test( SIZE_MAX, "%010d", INT_MAX );
119 test( SIZE_MAX, "%011d", INT_MIN );
120 test( SIZE_MAX, "%011d", INT_MAX );
121 test( SIZE_MAX, "%012d", INT_MIN );
122 test( SIZE_MAX, "%012d", INT_MAX );
123 test( SIZE_MAX, "%-09d", INT_MIN );
124 test( SIZE_MAX, "%-09d", INT_MAX );
125 test( SIZE_MAX, "%-010d", INT_MIN );
126 test( SIZE_MAX, "%-010d", INT_MAX );
127 test( SIZE_MAX, "%-011d", INT_MIN );
128 test( SIZE_MAX, "%-011d", INT_MAX );
129 test( SIZE_MAX, "%-012d", INT_MIN );
130 test( SIZE_MAX, "%-012d", INT_MAX );
131 test( 8, "%9d", INT_MAX );
132 test( 8, "%9d", INT_MIN );
133 test( 9, "%9d", INT_MAX );
134 test( 9, "%9d", INT_MIN );
135 test( 10, "%9d", INT_MAX );
136 test( 10, "%9d", INT_MIN );
137 test( 9, "%10d", INT_MAX );
138 test( 9, "%10d", INT_MIN );
139 test( 10, "%10d", INT_MAX );
140 test( 10, "%10d", INT_MIN );
141 test( 11, "%10d", INT_MAX );
142 test( 11, "%10d", INT_MIN );
143 test( 10, "%11d", INT_MAX );
144 test( 10, "%11d", INT_MIN );
145 test( 11, "%11d", INT_MAX );
146 test( 11, "%11d", INT_MIN );
147 test( 12, "%11d", INT_MAX );
148 test( 12, "%11d", INT_MIN );
149 test( 11, "%12d", INT_MAX );
150 test( 11, "%12d", INT_MIN );
151 test( 12, "%12d", INT_MAX );
152 test( 12, "%12d", INT_MIN );
153 test( 13, "%12d", INT_MAX );
154 test( 13, "%12d", INT_MIN );
155 test( SIZE_MAX, "%030.20d", INT_MAX );
156 test( SIZE_MAX, "%.6x", UINT_MAX );
157 test( SIZE_MAX, "%#6.3x", UINT_MAX );
158 test( SIZE_MAX, "%#3.6x", UINT_MAX );
159 test( SIZE_MAX, "%.6d", INT_MIN );
160 test( SIZE_MAX, "%6.3d", INT_MIN );
161 test( SIZE_MAX, "%3.6d", INT_MIN );
162 test( SIZE_MAX, "%#0.6x", UINT_MAX );
163 test( SIZE_MAX, "%#06.3x", UINT_MAX );
164 test( SIZE_MAX, "%#03.6x", UINT_MAX );
165 test( SIZE_MAX, "%#0.6d", INT_MAX );
166 test( SIZE_MAX, "%#06.3d", INT_MAX );
167 test( SIZE_MAX, "%#03.6d", INT_MAX );
168 test( SIZE_MAX, "%#+.6d", INT_MAX );
169 test( SIZE_MAX, "%#+6.3d", INT_MAX );
170 test( SIZE_MAX, "%#+3.6d", INT_MAX );
171 test( SIZE_MAX, "%+0.6d", INT_MAX );
172 test( SIZE_MAX, "%+06.3d", INT_MAX );
173 test( SIZE_MAX, "%+03.6d", INT_MAX );
174 test( SIZE_MAX, "- %d", INT_MAX );
175 test( SIZE_MAX, "- %d %% %d", INT_MAX, INT_MIN );
176 test( SIZE_MAX, "%c", 'x' );
177 test( SIZE_MAX, "%s", "abcdef" );
178 test( SIZE_MAX, "%p", 0xdeadbeef );
182 /* This macro delivers a given character to either a memory buffer or a stream,
183 depending on the contents of 'status' (struct status_t).
184 x - the character to be delivered
185 i - pointer to number of characters already delivered in this call
186 n - pointer to maximum number of characters to be delivered in this call
187 s - the buffer into which the character shall be delivered
189 #define DELIVER( x ) do { if ( status->i < status->n ) { if ( status->stream != NULL ) putc( x, status->stream ); else status->s[status->i] = x; } ++(status->i); } while ( 0 )
191 /* This function recursively converts a given integer value to a given base
192 into a character string. Persistent information - like the number of digits
193 parsed so far - is recorded in a struct status_t, which allows to avoid
194 overwriting snprintf() limits, and enables the function to do the necessary
195 padding / prefixing of the character string eventually printed.
197 static void int2base( intmax_t value, struct status_t * status )
199 /* Registering the character being printed at the end of the function here
200 already so it will be taken into account when the deepestmost recursion
201 does the prefix / padding stuff.
204 if ( ( value / status->base ) != 0 )
206 /* More digits to be done - recurse deeper */
207 int2base( value / status->base, status );
211 /* We reached the last digit, the deepest point of our recursion, and
212 only now know how long the number to be printed actually is. Now we
213 have to do the sign, prefix, width, and precision padding stuff
214 before printing the numbers while we resurface from the recursion.
216 /* At worst, we need two prefix characters (hex prefix). */
217 char preface[3] = "\0";
219 if ( ( status->flags & E_alt ) && ( status->base == 16 || status->base == 8 ) )
221 /* Octal / hexadecimal prefix for "%#" conversions */
222 preface[ preidx++ ] = '0';
223 if ( status->base == 16 )
225 preface[ preidx++ ] = ( status->flags & E_lower ) ? 'x' : 'X';
230 /* Negative sign for negative values - at all times. */
231 preface[ preidx++ ] = '-';
233 else if ( ! ( status->flags & E_unsigned ) )
235 /* plus sign / extra space are only for unsigned conversions */
236 if ( status->flags & E_plus )
238 preface[ preidx++ ] = '+';
240 else if ( status->flags & E_space )
242 preface[ preidx++ ] = ' ';
246 size_t prec_pads = ( status->prec > status->this ) ? ( status->prec - status->this ) : 0;
247 if ( ! ( status->flags & ( E_minus | E_zero ) ) )
249 /* Space padding is only done if no zero padding or left alignment
250 is requested. Leave space for any prefixes determined above.
252 /* The number of characters to be printed, plus prefixes if any. */
253 /* This line contained probably the most stupid, time-wasting bug
254 I've ever perpetrated. Greetings to Samface, DevL, and all
255 sceners at Breakpoint 2006.
257 size_t characters = preidx + ( ( status->this > status->prec ) ? status->this : status->prec );
258 if ( status->width > characters )
260 for ( int i = 0; i < status->width - characters; ++i )
267 /* Now we did the padding, do the prefixes (if any). */
269 while ( preface[ preidx ] != '\0' )
271 DELIVER( preface[ preidx++ ] );
274 if ( ( ! ( status->flags & E_minus ) ) && ( status->flags & E_zero ) )
276 /* If field is not left aligned, and zero padding is requested, do
279 while ( status->this < status->width )
285 /* Do the precision padding if necessary. */
286 for ( int i = 0; i < prec_pads; ++i )
292 /* Recursion tail - print the current digit. */
294 int digit = value % status->base;
299 if ( status->flags & E_lower )
301 /* Lowercase letters. Same array used for strto...(). */
302 DELIVER( _PDCLIB_digits[ digit ] );
306 /* Uppercase letters. Array only used here, only 0-F. */
307 DELIVER( _PDCLIB_Xdigits[ digit ] );
312 /* This function is to be called with spec pointing to the leading '%' of a
313 printf() conversion specifier, with ap being
315 const char * parse_out( const char * spec, struct status_t * status )
317 const char * orig_spec = spec;
318 if ( *(++spec) == '%' )
323 /* Initializing status structure */
330 /* First come 0..n flags */
336 status->flags |= E_minus;
340 status->flags |= E_plus;
344 status->flags |= E_alt;
348 status->flags |= E_space;
352 status->flags |= E_zero;
356 status->flags |= E_done;
359 } while ( ! ( status->flags & E_done ) );
361 /* Optional field width */
364 /* Retrieve width value from argument stack */
365 if ( ( status->width = va_arg( status->ap, int ) ) < 0 )
367 /* Negative value is '-' flag plus absolute value */
368 status->flags |= E_minus;
375 /* If a width is given, strtol() will return its value. If not given,
376 strtol() will return zero. In both cases, endptr will point to the
377 rest of the conversion specifier - just what we need.
379 status->width = (int)strtol( spec, (char**)&spec, 10 );
382 /* Optional precision */
388 /* Retrieve precision value from argument stack. A negative value
389 is as if no precision is given - as precision is initalized to
390 EOF (negative), there is no need for testing for negative here.
392 status->prec = va_arg( status->ap, int );
397 status->prec = (int)strtol( spec, &endptr, 10 );
398 if ( spec == endptr )
400 /* Decimal point but no number - bad conversion specifier. */
405 /* Having a precision cancels out any zero flag. */
406 status->flags ^= E_zero;
409 /* Optional length modifier
410 We step one character ahead in any case, and step back only if we find
411 there has been no length modifier (or step ahead another character if it
412 has been "hh" or "ll").
419 status->flags |= E_char;
424 status->flags |= E_short;
430 status->flags |= E_llong;
435 status->flags |= E_long;
439 status->flags |= E_intmax;
442 status->flags |= E_size;
445 status->flags |= E_ptrdiff;
448 status->flags |= E_double;
455 /* Conversion specifier */
465 status->flags |= E_unsigned;
469 status->flags |= E_unsigned;
473 status->flags |= ( E_lower | E_unsigned );
477 status->flags |= E_unsigned;
490 /* TODO: Flags, wide chars. */
491 DELIVER( va_arg( status->ap, int ) );
494 /* TODO: Flags, wide chars. */
496 char * s = va_arg( status->ap, char * );
504 /* TODO: E_long -> E_intptr */
506 status->flags |= ( E_lower | E_unsigned | E_alt | E_long );
510 int * val = va_arg( status->ap, int * );
515 /* No conversion specifier. Bad conversion. */
519 /* Do the actual output based on our findings */
520 if ( status->base != 0 )
522 /* Integer conversions */
523 /* TODO: Check for invalid flag combinations. */
524 if ( status->flags & E_unsigned )
527 switch ( status->flags & ( E_char | E_short | E_long | E_llong | E_size ) )
530 value = (uintmax_t)(unsigned char)va_arg( status->ap, int );
533 value = (uintmax_t)(unsigned short)va_arg( status->ap, int );
536 value = (uintmax_t)va_arg( status->ap, unsigned int );
539 value = (uintmax_t)va_arg( status->ap, unsigned long );
542 value = (uintmax_t)va_arg( status->ap, unsigned long long );
545 value = (uintmax_t)va_arg( status->ap, size_t );
549 if ( ( value / status->base ) != 0 )
551 int2base( (intmax_t)(value / status->base), status );
553 int digit = value % status->base;
558 if ( status->flags & E_lower )
560 DELIVER( _PDCLIB_digits[ digit ] );
564 DELIVER( _PDCLIB_Xdigits[ digit ] );
569 switch ( status->flags & ( E_char | E_short | E_long | E_llong | E_intmax ) )
572 int2base( (intmax_t)(char)va_arg( status->ap, int ), status );
575 int2base( (intmax_t)(short)va_arg( status->ap, int ), status );
578 int2base( (intmax_t)va_arg( status->ap, int ), status );
581 int2base( (intmax_t)va_arg( status->ap, long ), status );
584 int2base( (intmax_t)va_arg( status->ap, long long ), status );
587 int2base( (intmax_t)va_arg( status->ap, ptrdiff_t ), status );
590 int2base( va_arg( status->ap, intmax_t ), status );
594 if ( status->flags & E_minus )
596 while ( status->this < status->width )
602 if ( status->i >= status->n )
604 status->s[status->n - 1] = '\0';
610 inline void test( size_t n, const char * expect, ... )
612 char * buffer1 = malloc( 50 );
613 char * buffer2 = malloc( 50 );
617 va_start( ap, expect );
618 myrc = _PDCLIB_sprintf( buffer1, n, expect, ap );
619 rc = vsnprintf( buffer2, n, expect, ap );
620 if ( ( strcmp( buffer1, buffer2 ) != 0 ) || ( myrc != rc ) )
622 printf( "Output '%s', RC %d\nExpect '%s', RC %d\n\n", buffer1, myrc, buffer2, rc );
628 int _PDCLIB_sprintf( char * buffer, size_t n, const char * format, va_list ap )
630 struct status_t status = { 0, 0, n, 0, 0, buffer, 0, 0, NULL, ap };
631 while ( *format != '\0' )
634 if ( ( *format != '%' ) || ( ( rc = parse_out( format, &status ) ) == format ) )
636 /* No conversion specifier, print verbatim */
637 buffer[ status.i++ ] = *(format++);
641 /* Continue parsing after conversion specifier */
645 buffer[ status.i ] = '\0';
650 int _PDCLIB_fprintf( FILE * stream, const char * format, va_list ap )
652 struct status_t status = { 0, 0, SIZE_MAX, 0, 0, NULL, 0, 0, stream, ap };
653 while ( *format != '\0' )
656 if ( ( *format != '%' ) || ( ( rc = parse_out( format, &status, ap ) ) == format ) )
658 /* No conversion specifier, print verbatim */
659 putc( *(format++), stream );
663 /* Continue parsing after conversion specifier */