390 lines
11 KiB
C
390 lines
11 KiB
C
/*
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* Copyright (c) 1993-1994 by Xerox Corporation. All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*/
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/* An sprintf implementation that understands cords. This is probably */
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/* not terribly portable. It assumes an ANSI stdarg.h. It further */
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/* assumes that I can make copies of va_list variables, and read */
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/* arguments repeatedly by applyting va_arg to the copies. This */
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/* could be avoided at some performance cost. */
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/* We also assume that unsigned and signed integers of various kinds */
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/* have the same sizes, and can be cast back and forth. */
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/* We assume that void * and char * have the same size. */
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/* All this cruft is needed because we want to rely on the underlying */
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/* sprintf implementation whenever possible. */
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/* Boehm, September 21, 1995 6:00 pm PDT */
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#include "cord.h"
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#include "ec.h"
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include "gc.h"
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#define CONV_SPEC_LEN 50 /* Maximum length of a single */
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/* conversion specification. */
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#define CONV_RESULT_LEN 50 /* Maximum length of any */
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/* conversion with default */
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/* width and prec. */
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static int ec_len(CORD_ec x)
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{
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return(CORD_len(x[0].ec_cord) + (x[0].ec_bufptr - x[0].ec_buf));
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}
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/* Possible nonumeric precision values. */
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# define NONE -1
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# define VARIABLE -2
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/* Copy the conversion specification from CORD_pos into the buffer buf */
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/* Return negative on error. */
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/* Source initially points one past the leading %. */
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/* It is left pointing at the conversion type. */
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/* Assign field width and precision to *width and *prec. */
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/* If width or prec is *, VARIABLE is assigned. */
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/* Set *left to 1 if left adjustment flag is present. */
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/* Set *long_arg to 1 if long flag ('l' or 'L') is present, or to */
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/* -1 if 'h' is present. */
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static int extract_conv_spec(CORD_pos source, char *buf,
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int * width, int *prec, int *left, int * long_arg)
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{
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register int result = 0;
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register int current_number = 0;
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register int saw_period = 0;
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register int saw_number;
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register int chars_so_far = 0;
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register char current;
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*width = NONE;
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buf[chars_so_far++] = '%';
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while(CORD_pos_valid(source)) {
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if (chars_so_far >= CONV_SPEC_LEN) return(-1);
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current = CORD_pos_fetch(source);
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buf[chars_so_far++] = current;
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switch(current) {
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case '*':
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saw_number = 1;
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current_number = VARIABLE;
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break;
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case '0':
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if (!saw_number) {
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/* Zero fill flag; ignore */
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break;
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} /* otherwise fall through: */
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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saw_number = 1;
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current_number *= 10;
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current_number += current - '0';
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break;
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case '.':
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saw_period = 1;
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if(saw_number) {
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*width = current_number;
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saw_number = 0;
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}
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current_number = 0;
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break;
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case 'l':
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case 'L':
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*long_arg = 1;
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current_number = 0;
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break;
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case 'h':
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*long_arg = -1;
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current_number = 0;
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break;
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case ' ':
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case '+':
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case '#':
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current_number = 0;
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break;
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case '-':
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*left = 1;
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current_number = 0;
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break;
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case 'd':
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case 'i':
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case 'o':
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case 'u':
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case 'x':
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case 'X':
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case 'f':
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case 'e':
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case 'E':
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case 'g':
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case 'G':
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case 'c':
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case 'C':
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case 's':
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case 'S':
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case 'p':
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case 'n':
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case 'r':
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goto done;
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default:
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return(-1);
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}
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CORD_next(source);
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}
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return(-1);
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done:
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if (saw_number) {
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if (saw_period) {
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*prec = current_number;
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} else {
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*prec = NONE;
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*width = current_number;
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}
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} else {
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*prec = NONE;
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}
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buf[chars_so_far] = '\0';
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return(result);
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}
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int CORD_vsprintf(CORD * out, CORD format, va_list args)
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{
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CORD_ec result;
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register int count;
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register char current;
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CORD_pos pos;
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char conv_spec[CONV_SPEC_LEN + 1];
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CORD_ec_init(result);
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for (CORD_set_pos(pos, format, 0); CORD_pos_valid(pos); CORD_next(pos)) {
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current = CORD_pos_fetch(pos);
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if (current == '%') {
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CORD_next(pos);
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if (!CORD_pos_valid(pos)) return(-1);
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current = CORD_pos_fetch(pos);
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if (current == '%') {
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CORD_ec_append(result, current);
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} else {
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int width, prec;
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int left_adj = 0;
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int long_arg = 0;
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CORD arg;
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size_t len;
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if (extract_conv_spec(pos, conv_spec,
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&width, &prec,
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&left_adj, &long_arg) < 0) {
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return(-1);
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}
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current = CORD_pos_fetch(pos);
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switch(current) {
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case 'n':
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/* Assign length to next arg */
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if (long_arg == 0) {
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int * pos_ptr;
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pos_ptr = va_arg(args, int *);
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*pos_ptr = ec_len(result);
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} else if (long_arg > 0) {
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long * pos_ptr;
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pos_ptr = va_arg(args, long *);
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*pos_ptr = ec_len(result);
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} else {
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short * pos_ptr;
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pos_ptr = va_arg(args, short *);
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*pos_ptr = ec_len(result);
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}
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goto done;
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case 'r':
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/* Append cord and any padding */
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if (width == VARIABLE) width = va_arg(args, int);
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if (prec == VARIABLE) prec = va_arg(args, int);
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arg = va_arg(args, CORD);
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len = CORD_len(arg);
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if (prec != NONE && len > prec) {
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if (prec < 0) return(-1);
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arg = CORD_substr(arg, 0, prec);
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len = prec;
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}
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if (width != NONE && len < width) {
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char * blanks = GC_MALLOC_ATOMIC(width-len+1);
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memset(blanks, ' ', width-len);
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blanks[width-len] = '\0';
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if (left_adj) {
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arg = CORD_cat(arg, blanks);
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} else {
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arg = CORD_cat(blanks, arg);
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}
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}
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CORD_ec_append_cord(result, arg);
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goto done;
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case 'c':
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if (width == NONE && prec == NONE) {
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register char c = va_arg(args, char);
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CORD_ec_append(result, c);
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goto done;
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}
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break;
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case 's':
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if (width == NONE && prec == NONE) {
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char * str = va_arg(args, char *);
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register char c;
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while (c = *str++) {
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CORD_ec_append(result, c);
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}
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goto done;
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}
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break;
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default:
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break;
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}
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/* Use standard sprintf to perform conversion */
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{
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register char * buf;
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va_list vsprintf_args = args;
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/* The above does not appear to be sanctioned */
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/* by the ANSI C standard. */
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int max_size = 0;
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int res;
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if (width == VARIABLE) width = va_arg(args, int);
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if (prec == VARIABLE) prec = va_arg(args, int);
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if (width != NONE) max_size = width;
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if (prec != NONE && prec > max_size) max_size = prec;
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max_size += CONV_RESULT_LEN;
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if (max_size >= CORD_BUFSZ) {
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buf = GC_MALLOC_ATOMIC(max_size + 1);
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} else {
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if (CORD_BUFSZ - (result[0].ec_bufptr-result[0].ec_buf)
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< max_size) {
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CORD_ec_flush_buf(result);
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}
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buf = result[0].ec_bufptr;
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}
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switch(current) {
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case 'd':
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case 'i':
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case 'o':
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case 'u':
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case 'x':
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case 'X':
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case 'c':
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if (long_arg <= 0) {
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(void) va_arg(args, int);
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} else if (long_arg > 0) {
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(void) va_arg(args, long);
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}
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break;
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case 's':
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case 'p':
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(void) va_arg(args, char *);
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break;
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case 'f':
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case 'e':
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case 'E':
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case 'g':
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case 'G':
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(void) va_arg(args, double);
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break;
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default:
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return(-1);
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}
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res = vsprintf(buf, conv_spec, vsprintf_args);
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len = (size_t)res;
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if ((char *)(GC_word)res == buf) {
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/* old style vsprintf */
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len = strlen(buf);
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} else if (res < 0) {
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return(-1);
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}
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if (buf != result[0].ec_bufptr) {
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register char c;
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while (c = *buf++) {
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CORD_ec_append(result, c);
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}
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} else {
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result[0].ec_bufptr = buf + len;
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}
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}
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done:;
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}
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} else {
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CORD_ec_append(result, current);
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}
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}
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count = ec_len(result);
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*out = CORD_balance(CORD_ec_to_cord(result));
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return(count);
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}
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int CORD_sprintf(CORD * out, CORD format, ...)
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{
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va_list args;
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int result;
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va_start(args, format);
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result = CORD_vsprintf(out, format, args);
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va_end(args);
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return(result);
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}
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int CORD_fprintf(FILE * f, CORD format, ...)
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{
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va_list args;
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int result;
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CORD out;
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va_start(args, format);
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result = CORD_vsprintf(&out, format, args);
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va_end(args);
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if (result > 0) CORD_put(out, f);
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return(result);
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}
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int CORD_vfprintf(FILE * f, CORD format, va_list args)
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{
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int result;
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CORD out;
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result = CORD_vsprintf(&out, format, args);
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if (result > 0) CORD_put(out, f);
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return(result);
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}
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int CORD_printf(CORD format, ...)
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{
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va_list args;
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int result;
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CORD out;
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va_start(args, format);
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result = CORD_vsprintf(&out, format, args);
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va_end(args);
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if (result > 0) CORD_put(out, stdout);
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return(result);
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}
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int CORD_vprintf(CORD format, va_list args)
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{
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int result;
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CORD out;
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result = CORD_vsprintf(&out, format, args);
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if (result > 0) CORD_put(out, stdout);
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return(result);
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}
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