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-rw-r--r--src/printf.c481
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diff --git a/src/printf.c b/src/printf.c
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+/* printf - format and print data
+ Copyright (C) 1990, 1991 Free Software Foundation, Inc.
+
+ 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, 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. */
+
+/* Usage: printf format [argument...]
+
+ A front end to the printf function that lets it be used from the shell.
+
+ Backslash escapes:
+
+ \" = double quote
+ \\ = backslash
+ \a = alert (bell)
+ \b = backspace
+ \c = produce no further output
+ \f = form feed
+ \n = new line
+ \r = carriage return
+ \t = horizontal tab
+ \v = vertical tab
+ \0ooo = octal number (ooo is 0 to 3 digits)
+ \xhhh = hexadecimal number (hhh is 1 to 3 digits)
+
+ Additional directive:
+
+ %b = print an argument string, interpreting backslash escapes
+
+ The `format' argument is re-used as many times as necessary
+ to convert all of the given arguments.
+
+ David MacKenzie <djm@gnu.ai.mit.edu> */
+
+#include <stdio.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include "system.h"
+
+#ifndef STDC_HEADERS
+double strtod ();
+long strtol ();
+unsigned long strtoul ();
+#endif
+
+#define isodigit(c) ((c) >= '0' && (c) <= '7')
+#define hextobin(c) ((c)>='a'&&(c)<='f' ? (c)-'a'+10 : (c)>='A'&&(c)<='F' ? (c)-'A'+10 : (c)-'0')
+#define octtobin(c) ((c) - '0')
+
+char *xmalloc ();
+double xstrtod ();
+int print_esc ();
+int print_formatted ();
+long xstrtol ();
+unsigned long xstrtoul ();
+void error ();
+void print_direc ();
+void print_esc_char ();
+void print_esc_string ();
+void verify ();
+
+/* The name this program was run with. */
+char *program_name;
+
+/* The value to return to the calling program. */
+int exit_status;
+
+void
+main (argc, argv)
+ int argc;
+ char **argv;
+{
+ char *format;
+ int args_used;
+
+ program_name = argv[0];
+ exit_status = 0;
+
+ if (argc == 1)
+ {
+ fprintf (stderr, "Usage: %s format [argument...]\n", program_name);
+ exit (1);
+ }
+
+ format = argv[1];
+ argc -= 2;
+ argv += 2;
+
+ do
+ {
+ args_used = print_formatted (format, argc, argv);
+ argc -= args_used;
+ argv += args_used;
+ }
+ while (args_used > 0 && argc > 0);
+
+ exit (exit_status);
+}
+
+/* Print the text in FORMAT, using ARGV (with ARGC elements) for
+ arguments to any `%' directives.
+ Return the number of elements of ARGV used. */
+
+int
+print_formatted (format, argc, argv)
+ char *format;
+ int argc;
+ char **argv;
+{
+ int save_argc = argc; /* Preserve original value. */
+ char *f; /* Pointer into `format'. */
+ char *direc_start; /* Start of % directive. */
+ int direc_length; /* Length of % directive. */
+ int field_width; /* Arg to first '*', or -1 if none. */
+ int precision; /* Arg to second '*', or -1 if none. */
+
+ for (f = format; *f; ++f)
+ {
+ switch (*f)
+ {
+ case '%':
+ direc_start = f++;
+ direc_length = 1;
+ field_width = precision = -1;
+ if (*f == '%')
+ {
+ putchar ('%');
+ break;
+ }
+ if (*f == 'b')
+ {
+ if (argc > 0)
+ {
+ print_esc_string (*argv);
+ ++argv;
+ --argc;
+ }
+ break;
+ }
+ if (index ("-+ #", *f))
+ {
+ ++f;
+ ++direc_length;
+ }
+ if (*f == '*')
+ {
+ ++f;
+ ++direc_length;
+ if (argc > 0)
+ {
+ field_width = xstrtoul (*argv);
+ ++argv;
+ --argc;
+ }
+ else
+ field_width = 0;
+ }
+ else
+ while (isdigit (*f))
+ {
+ ++f;
+ ++direc_length;
+ }
+ if (*f == '.')
+ {
+ ++f;
+ ++direc_length;
+ if (*f == '*')
+ {
+ ++f;
+ ++direc_length;
+ if (argc > 0)
+ {
+ precision = xstrtoul (*argv);
+ ++argv;
+ --argc;
+ }
+ else
+ precision = 0;
+ }
+ else
+ while (isdigit (*f))
+ {
+ ++f;
+ ++direc_length;
+ }
+ }
+ if (*f == 'l' || *f == 'L' || *f == 'h')
+ {
+ ++f;
+ ++direc_length;
+ }
+ if (!index ("diouxXfeEgGcs", *f))
+ error (1, 0, "%%%c: invalid directive", *f);
+ ++direc_length;
+ if (argc > 0)
+ {
+ print_direc (direc_start, direc_length, field_width,
+ precision, *argv);
+ ++argv;
+ --argc;
+ }
+ else
+ print_direc (direc_start, direc_length, field_width,
+ precision, "");
+ break;
+
+ case '\\':
+ f += print_esc (f);
+ break;
+
+ default:
+ putchar (*f);
+ }
+ }
+
+ return save_argc - argc;
+}
+
+/* Print a \ escape sequence starting at ESCSTART.
+ Return the number of characters in the escape sequence
+ besides the backslash. */
+
+int
+print_esc (escstart)
+ char *escstart;
+{
+ register char *p = escstart + 1;
+ int esc_value = 0; /* Value of \nnn escape. */
+ int esc_length; /* Length of \nnn escape. */
+
+ /* \0ooo and \xhhh escapes have maximum length of 3 chars. */
+ if (*p == 'x')
+ {
+ for (esc_length = 0, ++p;
+ esc_length < 3 && isxdigit (*p);
+ ++esc_length, ++p)
+ esc_value = esc_value * 16 + hextobin (*p);
+ if (esc_length == 0)
+ error (1, 0, "missing hexadecimal number in escape");
+ putchar (esc_value);
+ }
+ else if (*p == '0')
+ {
+ for (esc_length = 0, ++p;
+ esc_length < 3 && isodigit (*p);
+ ++esc_length, ++p)
+ esc_value = esc_value * 8 + octtobin (*p);
+ putchar (esc_value);
+ }
+ else if (index ("\"\\abcfnrtv", *p))
+ print_esc_char (*p++);
+ else
+ error (1, 0, "\\%c: invalid escape", *p);
+ return p - escstart - 1;
+}
+
+/* Output a single-character \ escape. */
+
+void
+print_esc_char (c)
+ char c;
+{
+ switch (c)
+ {
+ case 'a': /* Alert. */
+ putchar (7);
+ break;
+ case 'b': /* Backspace. */
+ putchar (8);
+ break;
+ case 'c': /* Cancel the rest of the output. */
+ exit (0);
+ break;
+ case 'f': /* Form feed. */
+ putchar (12);
+ break;
+ case 'n': /* New line. */
+ putchar (10);
+ break;
+ case 'r': /* Carriage return. */
+ putchar (13);
+ break;
+ case 't': /* Horizontal tab. */
+ putchar (9);
+ break;
+ case 'v': /* Vertical tab. */
+ putchar (11);
+ break;
+ default:
+ putchar (c);
+ break;
+ }
+}
+
+/* Print string STR, evaluating \ escapes. */
+
+void
+print_esc_string (str)
+ char *str;
+{
+ for (; *str; str++)
+ if (*str == '\\')
+ str += print_esc (str);
+ else
+ putchar (*str);
+}
+
+/* Output a % directive. START is the start of the directive,
+ LENGTH is its length, and ARGUMENT is its argument.
+ If FIELD_WIDTH or PRECISION is non-negative, they are args for
+ '*' values in those fields. */
+
+void
+print_direc (start, length, field_width, precision, argument)
+ char *start;
+ int length;
+ int field_width;
+ int precision;
+ char *argument;
+{
+ char *p; /* Null-terminated copy of % directive. */
+
+ p = xmalloc ((unsigned) (length + 1));
+ strncpy (p, start, length);
+ p[length] = 0;
+
+ switch (p[length - 1])
+ {
+ case 'd':
+ case 'i':
+ if (field_width < 0)
+ {
+ if (precision < 0)
+ printf (p, xstrtol (argument));
+ else
+ printf (p, precision, xstrtol (argument));
+ }
+ else
+ {
+ if (precision < 0)
+ printf (p, field_width, xstrtol (argument));
+ else
+ printf (p, field_width, precision, xstrtol (argument));
+ }
+ break;
+
+ case 'o':
+ case 'u':
+ case 'x':
+ case 'X':
+ if (field_width < 0)
+ {
+ if (precision < 0)
+ printf (p, xstrtoul (argument));
+ else
+ printf (p, precision, xstrtoul (argument));
+ }
+ else
+ {
+ if (precision < 0)
+ printf (p, field_width, xstrtoul (argument));
+ else
+ printf (p, field_width, precision, xstrtoul (argument));
+ }
+ break;
+
+ case 'f':
+ case 'e':
+ case 'E':
+ case 'g':
+ case 'G':
+ if (field_width < 0)
+ {
+ if (precision < 0)
+ printf (p, xstrtod (argument));
+ else
+ printf (p, precision, xstrtod (argument));
+ }
+ else
+ {
+ if (precision < 0)
+ printf (p, field_width, xstrtod (argument));
+ else
+ printf (p, field_width, precision, xstrtod (argument));
+ }
+ break;
+
+ case 'c':
+ printf (p, *argument);
+ break;
+
+ case 's':
+ if (field_width < 0)
+ {
+ if (precision < 0)
+ printf (p, argument);
+ else
+ printf (p, precision, argument);
+ }
+ else
+ {
+ if (precision < 0)
+ printf (p, field_width, argument);
+ else
+ printf (p, field_width, precision, argument);
+ }
+ break;
+ }
+
+ free (p);
+}
+
+unsigned long
+xstrtoul (s)
+ char *s;
+{
+ char *end;
+ unsigned long val;
+
+ errno = 0;
+ val = strtoul (s, &end, 0);
+ verify (s, end);
+ return val;
+}
+
+long
+xstrtol (s)
+ char *s;
+{
+ char *end;
+ long val;
+
+ errno = 0;
+ val = strtol (s, &end, 0);
+ verify (s, end);
+ return val;
+}
+
+double
+xstrtod (s)
+ char *s;
+{
+ char *end;
+ double val;
+
+ errno = 0;
+ val = strtod (s, &end);
+ verify (s, end);
+ return val;
+}
+
+void
+verify (s, end)
+ char *s, *end;
+{
+ if (errno)
+ {
+ error (0, errno, "%s", s);
+ exit_status = 1;
+ }
+ else if (*end)
+ {
+ if (s == end)
+ error (0, 0, "%s: expected a numeric value", s);
+ else
+ error (0, 0, "%s: value not completely converted", s);
+ exit_status = 1;
+ }
+}
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