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Diffstat (limited to 'libc/stdio1/printf.c')
| -rw-r--r-- | libc/stdio1/printf.c | 649 |
1 files changed, 0 insertions, 649 deletions
diff --git a/libc/stdio1/printf.c b/libc/stdio1/printf.c deleted file mode 100644 index f2a39bd..0000000 --- a/libc/stdio1/printf.c +++ /dev/null @@ -1,649 +0,0 @@ -/* fprintf.c for limited Linux libc - Copyright (C) 1996 Joel N. Weber II <nemo@koa.iolani.honolulu.hi.us> - - This program is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public License - as published by the Free Software Foundation; either version 2 - of the License, or (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ -/* Thanks Alan for writing the hard routine for me :-) - * Alan said that this works "most of the time". Something tells me I'm making - * it even worse! */ -/* The basic idea here is to make fprintf the core routine. printf obviously - can just call fprintf with stdout followed by all of its arguments. - sprintf() works using the fake file &the_sprintf. It's marked as fully - buffered, so that it will only write(2) when &the_sprintf->bufpos == - &the_sprintf->bufend, which I doubt will happen since &the_sprintf->bufend - = 0. The trick is that sprintf must set &the_sprintf->bufstart = - &the_sprintf->bufpos = its first argument. Not as orthagonal (is that - the right word?) as glibc's facilities for non-files, but this isn't a - library for people who have unlimited RAM budgets. (not like the libc - I use on linux/i586 enjoys an unlimited RAM budget either; I only have - 8 MB - - I'm not sure what the "correct" way to pass the variable arguments - from one function to the next is. Rather than pass the arguments - themselves, I'm passing a pointer to them. However, the following - explaination from Alan is probably a polite way of saying it will not - work on a 386 anyway. - Joel Weber - - [ I've migrated all of this code over to the ELKS stdarg that I wrote. - The accepted way to do it is for the wrapper function to accept a - variable number of arguments, use stdarg to make an argument pointer, - and then pass the argument pointer on to the core function, as I've - done here. This should definitely work on a 386, as the arguments - are still passed in the stack, and stack order is maintained. -Nat ] - */ - -/* - * This is NOT stunningly portable, but works - * for pretty dumb non ANSI compilers and is - * tight. Adjust the sizes to taste. - * - * Illegal format strings will break it. Only the - * following simple subset is supported - * - * %x - hex - * %d - decimal - * %s - string - * %c - char - * - * And the h/l length specifiers for %d/%x - * - * Alan Cox. - */ - -#include <stdarg.h> -#include "stdio.h" - -/* 17 to make sure that there's room for the trailing newline. - I'm not really sure if this is ideal... */ -static char nstring[17]="0123456789ABCDEF"; - -static unsigned char * -__numout(long i, int base) -{ - static unsigned char out[16]; - int n; - int flg = 0; - unsigned long val; - - if (i<0 && base==10) - { - flg = 1; - i = -i; - } - val = i; - - for (n = 0; n < 15; n++) - out[n] = ' '; - out[15] = '\0'; - n = 14; - do{ - out[n] = nstring[val % base]; - n--; - val /= base; - } - while(val); - if(flg) out[n--] = '-'; - return &out[n+1]; -} - -int -fprintf(FILE * stream, __const char * fmt, ...) -{ - va_list ap; - int retval; - va_start(ap, fmt); - retval=internal_fprintf(stream, fmt, ap); - va_end(ap); - return(retval); -} - -int -printf(__const char * fmt, ...) -{ - va_list ap; - int retval; - va_start(ap, fmt); - retval=internal_fprintf(stdout, fmt, ap); - va_end(ap); - return(retval); -} - -/* This is a strange way of doing sprintf, but it should work */ -int sprintf(char * s, __const char * fmt, ...) -{ - static FILE the_sprintf = { - -1, - 0, - 0, - 0, - 0, - _IOFBF, - _MODE_WRITE, - 0, 0, - 0, 0}; - va_list ap; - int retval; - - va_start(ap, fmt); - the_sprintf.bufstart = the_sprintf.bufpos = (unsigned char *) s; - the_sprintf.fc_err = 0; - - retval = internal_fprintf(&the_sprintf, fmt, ap); - /* null-terminate the string */ - putc('\0', &the_sprintf); - - va_end(ap); - return retval; -} - - - - - -/* - * printf.c - This is the more complete fprintf() replacement for libc8086 - * Copyright (C) 1996 Steven Huang <sthuang@hns.com>. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include <stdio.h> -#include <string.h> -#include <ctype.h> - -/* - * This decides if the little test main program gets included - */ -#undef TEST -/* - * This decides if printf() should act like standard. When undefined, - * - prints out "(err)" if a bad format is encountered - * - supports the %b (binary) format - */ -#define STANDARD - -/* - * Shut bcc up about 'const', which doesn't seem to be handled right - * by unproto. - */ -#ifdef __BCC__ -#define const -#endif - -#define BUF_SIZE 128 -#define OUTC(c) { putc(c, stream); n++; } -#define max(a, b) ((a > b) ? a : b) -/* - * if you change the ff, you need to change the order of characters in - * the string 'flagstr' defined in _printf() - */ -#define FLAG_PADZERO (1<<0) -#define FLAG_LEFTJUST (1<<1) -#define FLAG_SIGNED (1<<2) -#define FLAG_ALT (1<<3) -#define FLAG_SPACE (1<<4) - -static char *utoa(unsigned int val, char *buf, int radix) -/* - * Converts an integer to a variable-radix string representation - * - * Note: - * Does not perform sanity checking for 'radix' - * Assumes 'buf' has memory allocated to it - */ -{ - int divisor; - char *p = buf; - const char *digitstr = "0123456789abcdef"; - - for (divisor = 1; val / divisor >= radix; divisor *= radix); - do { - *p++ = digitstr[val / divisor]; - val %= divisor; - divisor /= radix; - } while (divisor >= 1); - *p = '\0'; - return(buf); -} - -static -internal_fprintf(FILE * stream, const char * fmt, char *args) - -/* static int _printf(FILE *stream, const char *fmt, char *args) */ -/* - * The one that does all the work. - * This is a fairly complete implementation of printf(), supporting - * everything EXCEPT: - * - floating point (eEDOUfg formats) - * - pointers (realizes them but doesn't understand how to print them) - * - short and long (h/l) modifiers (dunno what to do about them) - * It's even slightly faster than gcc's printf() on Linux. Can't beat - * HP-UX's printf() though ;) - * - * Supports: - * d, signed integer - * i - * o unsigned octal integer - * u unsigned integer - * x unsigned hex lowercase a-f - * X unsigned hex uppercase A-F - * c character - * s string (character pointer) - * p void pointer (ignores it) - * % % character - * n number of characters output so far - * - * Special feature: (no really, it's not a bug =) ) - * b prints an integer in binary form (i think this might come - * in handy *somewhere*) - * - * # alternate format for octal (leading 0) and hex (0x/0X) - * 0 leading zeroes for d, i, o, u, x, and X - * - left justify, overrides '0' - * ' ' (space) force a blank in front of positive numbers - * + force a sign in front of any number - * - * width.precision, including support for '*' (reads value from - * the parameter list (MUST BE INT)) - * - * h, short/long modifiers, recognized but ignored. - * l - * - * Warning: - * The way varargs is implemented in libc is evil. Don't think - * there's a better way, but misaligned or wrong parameters - * passed to printf() can break a lot of things. I've tried my - * best to handle errors in the format string, though. - * - * Each %something field cannot exceed 'BUF_SIZE' characters, - * which I set to 128 right now. %s fields are not subject to - * this limit. - * - * Note: - * The semicolon -looks- missing in a few places but that's - * because of the macro def of 'OUTC'. did it that way to - * save a few lines of source ;) - * - * Expects a 'char *' as varargs parameter, unlike libc8086's - * printf(), which takes a 'int *' then casts it to a 'char *'. - * Either has to change, but it should be trivial. - * - * This function aborts whenever it scans an illegal format, unlike - * gcc's libc which prints out the illegal format as if it's -not- - * a format string. The 'STANDARD' preprocessor flag controls if - * if just aborts (when defined) or prints out "(err)" (when undefined). - */ -{ - /* - * the "0-+# " and "dcs..." strings are listed in my idea of their - * frequency of use, with the most popular in front. not terribly - * important but strchr() might have an easier time that way. - * if you change the ordering of 'flagstr', make sure you update - * the #define FLAG_* stuff on top of this file too. - */ - char c, *s, *f; - const char *flagstr = "0-+# ", -#ifdef STANDARD - *typestr = "dcsixXuop"; -#else - *typestr = "dcsixXuopb"; -#endif - int n = 0, flags, width, actwidth, prec, bad = 0, neg, i; - static char buf[BUF_SIZE]; - - for (c = *fmt++; c && !bad;) { - if (c != '%') { /* just copy */ - OUTC(c); - c = *fmt++; - } - else { - c = *fmt++; /* chew the % sign */ - flags = width = prec = 0; - /* - * Parse the "0-+# " flags - */ - while ((f = strchr(flagstr, c)) != NULL) { - flags |= 1 << (f - flagstr); - c = *fmt++; - } - /* - * The '*' parameter says fetch width value from varargs - */ - if (c == '*') { - width = *(int *) args; - args += sizeof(int); - if (width < 0) { - width = abs(width); - flags |= FLAG_LEFTJUST; /* set '-' flag */ - } - c = *fmt++; - } - else - /* - * scan and convert the width parameter - */ - if (isdigit(c)) - while (isdigit(c)) { - width *= 10; - width += c - '0'; - c = *fmt++; - } - /* - * a '.' means there may be a precision parameter - */ - if (c == '.') { - c = *fmt++; - /* - * fetch precision value from varargs - */ - if (c == '*') { - prec = *(int *) args; - if (prec < 0) - prec = 0; - args += sizeof(int); - c = *fmt++; - } - else - /* - * scan and convert precision field - */ - if (isdigit(c)) - while (isdigit(c)) { - prec *= 10; - prec += c - '0'; - c = *fmt++; - } - } - /* - * short and long modifiers. ignored for the moment - */ - if (c == 'h') { - c = *fmt++; - } - else - if (c == 'l') { - c = *fmt++; - } - /* - * check if it's a valid type "dioux..." - */ - if (strchr(typestr, c) != NULL) { - neg = 0; - switch (c) { - case 'd': - case 'i': { - int val = *(int *) args; - args += sizeof(int); - neg = (val < 0); - val = abs(val); - actwidth = strlen(utoa(val, buf, 10)); } - /* - * if negative or '+'/' ' flags set - */ - if (neg || (flags & FLAG_SIGNED) || (flags & FLAG_SPACE)) - actwidth++; - break; - case 'u': { - unsigned int uval = *(unsigned int *) args; - args += sizeof(unsigned int); - actwidth = strlen(utoa(uval, buf, 10)); } - /* - * if '+'/' ' flags set - */ - if ((flags & FLAG_SIGNED) || (flags & FLAG_SPACE)) - actwidth++; - break; - case 'x': - case 'X': { - int val = *(int *) args; - args += sizeof(int); - actwidth = strlen(utoa(val, buf, 16)); } - if (flags & FLAG_ALT) - actwidth += 2; - break; - case 'o': { - int val = *(int *) args; - args += sizeof(int); - actwidth = strlen(utoa(val, buf, 8)); } - if (flags & FLAG_ALT) - actwidth++; - break; - case 's': - s = *(char **) args; - args += sizeof(char *); - actwidth = strlen(s); - break; - case 'c': - buf[0] = *(char *) args; - buf[1] = '\0'; - args += sizeof(char); - actwidth = 1; - break; - /* - * dunno how to handle pointers - what's the format of - * linux86 pointers?! right now just prints "(ptr)" - */ - case 'p': - strcpy(buf, "(ptr)"); - args += sizeof(void *); - actwidth = strlen(buf); - s = buf; /* pretend we're a string */ - c = 's'; - break; -#ifndef STANDARD - case 'b': { - int val = *(int *) args; - args += sizeof(int); - actwidth = strlen(utoa(val, buf, 2)); } - break; -#endif - } - /* - * strings behave differently to the width.precision - * parameters, so handle separately. besides, we avoid - * an extra 'memcpy' to 'buf' - */ - if (c == 's') { - if (prec == 0) - prec = actwidth; - width = max(width, prec); - /* - * pad to the left if not left justified - */ - if (!(flags & FLAG_LEFTJUST)) { - for (i = width; i > prec; i--) - OUTC(' '); - } - /* - * print out entire string if no precision specified, otherwise - * that's our upper limit - */ - if (prec == 0) - for (; *s; s++) - OUTC(*s) /* no semicolon here */ - else - for (i = 0; i < prec; i++) - OUTC(s[i]); - } - else { - /* - * precision is as wide as width if it's not specified and - * the leading zero '0' flag is set, and left-justify is - * -not- set. c standard says left justify overrides the - * leading 0. - */ - if (prec == 0 && (flags & FLAG_PADZERO) && !(flags & FLAG_LEFTJUST)) - prec = width; - /* - * expand width.precision to fit the actual width. printf - * width specifies the -minimum-, and aside from the - * precision of %s fields, there's no way to specify maximum - */ - prec = max(prec, actwidth); - width = max(width, prec); - /* - * pad to the left if we're not left justified - */ - if (!(flags & FLAG_LEFTJUST)) { - for (i = width; i > prec; i--) - OUTC(' '); - } - /* - * check if we might need to print the sign - */ - if (strchr("diu", c) != NULL) { - if (neg) /* print if negative */ - OUTC('-') /* yes, no ';' here =) */ - else - if (flags & FLAG_SIGNED) /* or '+' specified */ - OUTC('+') /* nor here */ - else - if (flags & FLAG_SPACE) /* or ' ' specified */ - OUTC(' ') /* nor here */ - } - /* - * the alternate '#' flag is set. doesn't affect all though - */ - if (flags & FLAG_ALT) { - switch (c) { - case 'o': - OUTC('0'); /* leading zero for octals */ - break; - case 'x': - case 'X': /* prints 0x or 0X */ - OUTC('0'); - OUTC(c); - break; - } - } - /* - * fill the precision field with either spaces or zeroes, - * depending if we're printing numbers - */ - if (strchr("diuxXo", c) != NULL) - for (i = prec; i > actwidth; i--) - OUTC('0') - else - for (i = prec; i > actwidth; i--) - OUTC(' '); - /* - * print the field, except for 'X', which we convert to caps - */ - if (c != 'X') - for (f = buf; *f; f++) - OUTC(*f) /* none here either */ - else - for (f = buf; *f; f++) - OUTC(toupper(*f)); - } - /* - * if we're left justified, we now need to pad spaces to the - * right so that width will be correct - */ - if (flags & FLAG_LEFTJUST) - for (i = width; i > prec; i--) - OUTC(' '); - } - else { - /* - * miscellaneous %thingies - */ - switch (c) { - case '%': /* %% -> % */ - OUTC('%'); - break; - case 'n': /* %n writes current output count */ - *(*(int **) args) = n; - args += sizeof(int *); - break; - default: /* oops, got a bad %thingy */ - bad = 1; - } - } - c = *fmt++; - } - } -#ifndef STANDARD - /* - * dunno what the standard wants if the format string is badly - * formed, so i print (err) if the debug flag is set - */ - if (bad) { - OUTC('('); - OUTC('e'); - OUTC('r'); - OUTC('r'); - OUTC(')'); - } -#endif - return(n); -} - -#ifdef TEST - -#include <time.h> - -int main() -{ - static unsigned char xbuf[128], *x; - char *fmt = "%s, %s %d, %.*d:%.*d\n"; - int rv1, rv2, i, dt1, dt2; - clock_t t1, t2; - - x = xbuf; - *(char **) x = "Sun"; - x += sizeof(char *); - *(char **) x = "Feb"; - x += sizeof(char *); - *(int *) x = 18; - x += sizeof(int); - *(int *) x = 2; - x += sizeof(int); - *(int *) x = 10; - x += sizeof(int); - *(int *) x = 2; - x += sizeof(int); - *(int *) x = 56; - x += sizeof(int); - t1 = clock(); - for (i = 0; i < 1000; i++) - rv1 = _printf(stdout, fmt, xbuf); - t2 = clock(); - dt1 = t2 - t1; - - t1 = clock(); - for (i = 0; i < 1000; i++) - rv2 = printf(fmt, "Sun", "Feb", 18, 2, 10, 2, 56); - t2 = clock(); - dt2 = t2 - t1; - - printf("\nrv1: %d, rv2: %d, dt1: %d, dt2: %d\n", rv1, rv2, dt1, dt2); - return(0); -} - -#endif |