/* * This file based on printf.c from 'Dlibs' on the atari ST (RdeBath) * * * Dale Schumacher 399 Beacon Ave. * (alias: Dalnefre') St. Paul, MN 55104 * dal@syntel.UUCP United States of America * "It's not reality that's important, but how you perceive things." */ /* Altered to use stdarg, made the core function vfnprintf. * Hooked into the stdio package using 'inside information' * Altered sizeof() assumptions, now assumes all integers except chars * will be either * sizeof(xxx) == sizeof(long) or sizeof(xxx) == sizeof(short) * * -RDB */ /* * Manuel Novoa III Dec 2000 * * The previous vfnprintf routine was almost completely rewritten with the * goal of fixing some shortcomings and reducing object size. * * The summary of changes: * * Converted print conversion specification parsing from one big switch * to a method using string tables. This new method verifies that the * conversion flags, field width, precision, qualifier, and specifier * appear in the correct order. Many questionable specifications were * accepted by the previous code. This new method also resulted in a * substantial reduction in object size of about 330 bytes (20%) from * the old version (1627 bytes) on i386, even with the following * improvements. * * Implemented %n specifier as required by the standards. * Implemented proper handling of precision for int types. * Implemented # for hex and pointer, fixed error for octal rep of 0. * Implemented return of -1 on stream error. * * Added optional support for the GNU extension %m which prints the string * corresponding the errno. * * Added optional support for long long ints and unsigned long long ints * using the conversion qualifiers "ll", "L", or "q" (like glibc). * * Added optional support for doubles in a very limited form. None of * the formating options are obeyed. The string returned by __dtostr * is printed directly. * * Converted to use my (un)signed long (long) to string routines, which are * smaller than the previous functions and don't require static buffers. * * Other Modifications: * Modified sprintf, snprintf, vsprintf, vsnprintf to share on fake-file. */ /* * Manuel Novoa III Jan 2001 * * Removed fake file from *s*printf functions because of possible problems * if called recursively. Instead, have sprintf, snprintf, and vsprintf * call vsnprintf which allocates a fake file on the stack. * Removed WANT_FPUTC option. Always use standard putc macro to avoid * problems with the fake file used by the *s*printf functions. * Fixed bug parsing flags -- did not restart scan. * Added function asprintf. * Fixed 0-pad prefixing bug. * Converted sizeof(int) == sizeof(long) tests to compile time vs run time. * This saves 112 bytes of code on i386. * Fixed precision bug -- when negative set to default. * Added function fnprintf to support __dtostr. * Added floating point support for doubles. Yeah! * * * May 2001 Fixes from Johan Adolfsson (johan.adolfsson@axis.com) * 1) printf("%c",0) returned 0 instead of 1. * 2) unrolled loop in asprintf to reduce size and remove compile warning. * * * June 2001 * 1) fix %p so that "0x" is prepended to outputed hex val * 2) fix %p so that "(nil)" is output for (void *)0 to match glibc * */ /*****************************************************************************/ /* OPTIONS */ /*****************************************************************************/ /* The optional support for long longs and doubles comes in two forms. * * 1) Normal (or partial for doubles) output support. Set to 1 to turn on. * Adds about 130 bytes for doubles, about 220 bytes for long longs, * and about 275 for both to the base code size of 1163 on i386. */ /* These are now set in uClibc_config.h based on Config. */ /* #define __UCLIBC_HAS_FLOATS__ 1 */ /* 2) An error message is inserted into the stream, an arg of the * appropriate size is removed from the arglist, and processing * continues. This is adds less code and may be useful in some * cases. Set to 1 to turn on. Adds about 50 bytes for doubles, * about 140 bytes for long longs, and about 175 bytes for both * to the base code size of 1163 on i386. */ #define WANT_FLOAT_ERROR 0 /* * Set to support GNU extension of %m to print string corresponding to errno. * * Warning: This adds about 50 bytes (i386) to the code but it also pulls in * strerror and the corresponding string table which together are about 3.8k. */ #define WANT_GNU_ERRNO 0 /**************************************************************************/ #define _GNU_SOURCE /* for strnlen */ #define _STDIO_UTILITY #include <stdio.h> #include <stdarg.h> #include <limits.h> #include <string.h> #include <errno.h> #define __PRINTF_INFO_NO_BITFIELD #include <printf.h> #ifdef __STDIO_THREADSAFE #include <pthread.h> #endif /* __STDIO_THREADSAFE */ /* #undef __UCLIBC_HAS_FLOATS__ */ /* #undef WANT_FLOAT_ERROR */ /* #define WANT_FLOAT_ERROR 1 */ #define __isdigit(c) (((unsigned int)(c - '0')) < 10) extern size_t _dtostr(FILE * fp, long double x, struct printf_info *info); enum { FLAG_PLUS = 0, FLAG_MINUS_LJUSTIFY, FLAG_HASH, FLAG_0_PAD, FLAG_SPACE, }; /* layout 01234 */ static const char spec[] = "+-#0 "; static const char qual[] = "hlLq"; #if !defined(__UCLIBC_HAS_FLOATS__) && WANT_FLOAT_ERROR static const char dbl_err[] = "<DOUBLE>"; #endif #if defined(__UCLIBC_HAS_FLOATS__) || WANT_FLOAT_ERROR /* layout 012345678901234567 */ static const char u_spec[] = "%nbopxXudicsfgGeEaA"; #else /* layout 0123456789012 */ static const char u_spec[] = "%nbopxXudics"; #endif /* WARNING: u_spec and u_radix need to stay in agreement!!! */ /* u_radix[i] <-> u_spec[i+2] for unsigned entries only */ static const char u_radix[] = "\x02\x08\x10\x10\x10\x0a"; int vfprintf(FILE * __restrict op, register const char * __restrict fmt, va_list ap) { int i, cnt, lval, len; char *p; const char *fmt0; int preci, width; #define upcase i int radix, dpoint /*, upcase*/; char tmp[65]; /* TODO - determing needed size from headers */ char flag[sizeof(spec)]; __STDIO_THREADLOCK(op); cnt = 0; while (*fmt) { if (*fmt == '%') { fmt0 = fmt; /* save our position in case of bad format */ ++fmt; width = -1; /* min field width */ preci = -5; /* max string width or mininum digits */ radix = 10; /* number base */ dpoint = 0; /* found decimal point */ #if INT_MAX != LONG_MAX lval = 0; /* sizeof(int) != sizeof(long) */ #else lval = 1; /* sizeof(int) == sizeof(long) */ #endif /* init flags */ for (p =(char *) spec ; *p ; p++) { flag[p-spec] = '\0'; } flag[FLAG_0_PAD] = ' '; /* process optional flags */ for (p = (char *)spec ; *p ; ) { if (*fmt == *p) { flag[p-spec] = *fmt++; p = (char *)spec; /* restart scan */ } else { p++; } } if (!flag[FLAG_PLUS]) { flag[FLAG_PLUS] = flag[FLAG_SPACE]; } /* process optional width and precision */ do { if (*fmt == '.') { ++fmt; dpoint = 1; } if (*fmt == '*') { /* parameter width value */ ++fmt; i = va_arg(ap, int); } else { for ( i = 0 ; (*fmt >= '0') && (*fmt <= '9') ; ++fmt ) { i = (i * 10) + (*fmt - '0'); } } if (dpoint) { preci = i; if (i<0) { preci = -5; } } else { width = i; if (i<0) { width = -i; flag[FLAG_MINUS_LJUSTIFY] = 1; } } } while ((*fmt == '.') && !dpoint ); /* process optional qualifier */ for (p = (char *) qual ; *p ; p++) { if (*p == *fmt) { lval = p - qual; ++fmt; /* TODO - hh */ if ((*p == 'l') && (*fmt == *p)) { ++lval; ++fmt; } } } #if WANT_GNU_ERRNO if (*fmt == 'm') { flag[FLAG_PLUS] = '\0'; flag[FLAG_0_PAD] = ' '; p = strerror(errno); goto print; } #endif /* process format specifier */ for (p = (char *) u_spec ; *p ; p++) { if (*fmt != *p) continue; if (p-u_spec < 1) { /* print a % */ goto charout; } if (p-u_spec < 2) { /* store output count in int ptr */ *(va_arg(ap, int *)) = cnt; goto nextfmt; } if (p-u_spec < 8) { /* unsigned conversion */ radix = u_radix[p-u_spec-2]; upcase = ((*p == 'x') ? __UIM_LOWER : __UIM_UPPER); if (*p == 'p') { lval = (sizeof(char *) == sizeof(long)); upcase = __UIM_LOWER; flag[FLAG_HASH] = 'p'; } p = _uintmaxtostr((tmp + sizeof(tmp) - 1), ((lval>1) /* TODO -- longlong/long/int/short/char */ ? va_arg(ap, uintmax_t) : (uintmax_t) va_arg(ap, unsigned long)), radix, upcase); flag[FLAG_PLUS] = '\0'; /* meaningless for unsigned */ if (*p != '0') { /* non-zero */ if (flag[FLAG_HASH]) { if (radix == 8) { *--p = '0'; /* add leadding zero */ } else if (radix != 10) { /* either 2 or 16 */ flag[FLAG_PLUS] = '0'; *--p = 'b'; if (radix == 16) { *p = 'x'; if (*fmt == 'X') { *p = 'X'; } } } } } else if (flag[FLAG_HASH] == 'p') { /* null pointer */ p = "(nil)"; } } else if (p-u_spec < 10) { /* signed conversion */ p = _uintmaxtostr((tmp + sizeof(tmp) - 1), ((lval>1) /* TODO -- longlong/long/int/short/char */ ? va_arg(ap, uintmax_t) : (uintmax_t) ((long long) /* sign-extend! */ va_arg(ap, long))), -radix, upcase); } else if (p-u_spec < 12) { /* character or string */ flag[FLAG_PLUS] = '\0'; flag[FLAG_0_PAD] = ' '; if (*p == 'c') { /* character */ p = tmp; *p = va_arg(ap, int); /* This takes care of the "%c",0 case */ len = 1; goto print_len_set; } else { /* string */ p = va_arg(ap, char *); if (!p) { p = "(null)"; preci = 6; } else { if (preci < 0) { preci = INT_MAX; } } len = strnlen(p, preci); goto print_len_set; } #if defined(__UCLIBC_HAS_FLOATS__) || WANT_FLOAT_ERROR } else if (p-u_spec < 27) { /* floating point */ #endif /* defined(__UCLIBC_HAS_FLOATS__) || WANT_FLOAT_ERROR */ #if defined(__UCLIBC_HAS_FLOATS__) struct printf_info info; if (preci < 0) { preci = 6; } info.width = width; info.prec = preci; info.spec = *fmt; info.pad = flag[FLAG_0_PAD]; info._flags = 0; if (flag[FLAG_PLUS] == '+') { PRINT_INFO_SET_FLAG(&info,showsign); } else if (flag[FLAG_PLUS] == ' ') { PRINT_INFO_SET_FLAG(&info,space); } if (flag[FLAG_HASH]) { PRINT_INFO_SET_FLAG(&info,alt); } if (flag[FLAG_MINUS_LJUSTIFY]) { PRINT_INFO_SET_FLAG(&info,left); } cnt += _dtostr(op, ((lval > 1) ? va_arg(ap, long double) : (long double) va_arg(ap, double)), &info); goto nextfmt; #elif WANT_FLOAT_ERROR (void) ((lval > 1) ? va_arg(ap, long double) : va_arg(ap, double)); /* carry on */ p = (char *) dbl_err; #endif /* defined(__UCLIBC_HAS_FLOATS__) */ } #if WANT_GNU_ERRNO print: #endif { /* this used to be printfield */ /* cheaper than strlen call */ /* for ( len = 0 ; p[len] ; len++ ) { } */ len = strnlen(p, SIZE_MAX); print_len_set: if ((*p == '-') #if WANT_GNU_ERRNO && (*fmt != 'm') #endif && (*fmt != 's')) { flag[FLAG_PLUS] = *p++; --len; } if (flag[FLAG_PLUS]) { ++len; ++preci; if (flag[FLAG_PLUS] == '0') { /* base 16 */ ++preci; /* account for x or X */ } } if (preci >= 0) { if ((*fmt == 's') #if WANT_GNU_ERRNO || (*fmt == 'm') #endif ) { if (len > preci) { len = preci; } else { preci = len; } } preci -= len; if (preci < 0) { preci = 0; } width -= preci; } width -= len; if (width < 0) { width = 0; } if (preci < 0) { preci = 0; if (!flag[FLAG_MINUS_LJUSTIFY] /* && flag[FLAG_PLUS] */ && (flag[FLAG_0_PAD] == '0')) { preci = width; width = 0; } } while (width + len + preci) { unsigned char ch; /* right padding || left padding */ if ((!len && !preci) || (width && !flag[FLAG_MINUS_LJUSTIFY])) { ch = ' '; --width; } else if (flag[FLAG_PLUS]) { ch = flag[FLAG_PLUS]; /* sign */ if (flag[FLAG_PLUS]=='0') { /* base 16 case */ flag[FLAG_PLUS] = *p++; /* get the x|X */ } else { flag[FLAG_PLUS] = '\0'; } --len; } else if (preci) { ch = '0'; --preci; } else { ch = *p++; /* main field */ --len; } ++cnt; putc(ch, op); } } goto nextfmt; } fmt = fmt0; /* this was an illegal format */ } charout: ++cnt; putc(*fmt, op); /* normal char out */ nextfmt: ++fmt; } i = (__FERROR(op)) ? -1 : cnt; __STDIO_THREADLOCK(op); return i; }