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314 lines
6.5 KiB
C
314 lines
6.5 KiB
C
/* vi: set sw=4 ts=4: */
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/* printf - format and print data
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Copyright 1999 Dave Cinege
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Portions copyright (C) 1990-1996 Free Software Foundation, Inc.
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Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
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*/
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/* Usage: printf format [argument...]
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A front end to the printf function that lets it be used from the shell.
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Backslash escapes:
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\" = double quote
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\\ = backslash
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\a = alert (bell)
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\b = backspace
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\c = produce no further output
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\f = form feed
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\n = new line
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\r = carriage return
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\t = horizontal tab
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\v = vertical tab
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\0ooo = octal number (ooo is 0 to 3 digits)
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\xhhh = hexadecimal number (hhh is 1 to 3 digits)
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Additional directive:
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%b = print an argument string, interpreting backslash escapes
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The 'format' argument is re-used as many times as necessary
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to convert all of the given arguments.
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David MacKenzie <djm@gnu.ai.mit.edu> */
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// 19990508 Busy Boxed! Dave Cinege
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#include "libbb.h"
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typedef void (*converter)(const char *arg, void *result);
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static void multiconvert(const char *arg, void *result, converter convert)
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{
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char s[sizeof(int)*3 + 2];
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if (*arg == '"' || *arg == '\'') {
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sprintf(s, "%d", (unsigned char)arg[1]);
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arg = s;
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}
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convert(arg, result);
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/* if there was conversion error, print unconverted string */
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if (errno)
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fputs(arg, stderr);
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}
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static void conv_strtoul(const char *arg, void *result)
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{
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*(unsigned long*)result = bb_strtoul(arg, NULL, 0);
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}
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static void conv_strtol(const char *arg, void *result)
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{
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*(long*)result = bb_strtol(arg, NULL, 0);
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}
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static void conv_strtod(const char *arg, void *result)
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{
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char *end;
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/* Well, this one allows leading whitespace... so what */
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/* What I like much less is that "-" is accepted too! :( */
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*(double*)result = strtod(arg, &end);
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if (end[0]) errno = ERANGE;
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}
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static unsigned long my_xstrtoul(const char *arg)
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{
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unsigned long result;
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multiconvert(arg, &result, conv_strtoul);
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return result;
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}
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static long my_xstrtol(const char *arg)
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{
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long result;
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multiconvert(arg, &result, conv_strtol);
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return result;
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}
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static double my_xstrtod(const char *arg)
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{
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double result;
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multiconvert(arg, &result, conv_strtod);
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return result;
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}
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static void print_esc_string(char *str)
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{
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for (; *str; str++) {
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if (*str == '\\') {
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str++;
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putchar(bb_process_escape_sequence((const char **)&str));
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} else {
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putchar(*str);
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}
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}
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}
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static void print_direc(char *start, size_t length, int field_width, int precision,
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const char *argument)
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{
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char *p; /* Null-terminated copy of % directive. */
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p = xmalloc((unsigned) (length + 1));
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strncpy(p, start, length);
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p[length] = 0;
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switch (p[length - 1]) {
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case 'd':
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case 'i':
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if (field_width < 0) {
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if (precision < 0)
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printf(p, my_xstrtol(argument));
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else
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printf(p, precision, my_xstrtol(argument));
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} else {
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if (precision < 0)
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printf(p, field_width, my_xstrtol(argument));
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else
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printf(p, field_width, precision, my_xstrtol(argument));
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}
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break;
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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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if (field_width < 0) {
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if (precision < 0)
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printf(p, my_xstrtoul(argument));
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else
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printf(p, precision, my_xstrtoul(argument));
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} else {
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if (precision < 0)
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printf(p, field_width, my_xstrtoul(argument));
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else
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printf(p, field_width, precision, my_xstrtoul(argument));
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}
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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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if (field_width < 0) {
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if (precision < 0)
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printf(p, my_xstrtod(argument));
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else
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printf(p, precision, my_xstrtod(argument));
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} else {
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if (precision < 0)
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printf(p, field_width, my_xstrtod(argument));
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else
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printf(p, field_width, precision, my_xstrtod(argument));
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}
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break;
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case 'c':
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printf(p, *argument);
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break;
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case 's':
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if (field_width < 0) {
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if (precision < 0)
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printf(p, argument);
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else
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printf(p, precision, argument);
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} else {
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if (precision < 0)
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printf(p, field_width, argument);
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else
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printf(p, field_width, precision, argument);
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}
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break;
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}
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free(p);
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}
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/* Print the text in FORMAT, using ARGV (with ARGC elements) for
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arguments to any '%' directives.
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Return the number of elements of ARGV used. */
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static int print_formatted(char *format, int argc, char **argv)
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{
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int save_argc = argc; /* Preserve original value. */
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char *f; /* Pointer into 'format'. */
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char *direc_start; /* Start of % directive. */
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size_t direc_length; /* Length of % directive. */
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int field_width; /* Arg to first '*', or -1 if none. */
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int precision; /* Arg to second '*', or -1 if none. */
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for (f = format; *f; ++f) {
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switch (*f) {
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case '%':
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direc_start = f++;
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direc_length = 1;
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field_width = precision = -1;
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if (*f == '%') {
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putchar('%');
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break;
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}
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if (*f == 'b') {
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if (argc > 0) {
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print_esc_string(*argv);
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++argv;
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--argc;
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}
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break;
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}
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if (strchr("-+ #", *f)) {
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++f;
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++direc_length;
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}
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if (*f == '*') {
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++f;
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++direc_length;
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if (argc > 0) {
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field_width = my_xstrtoul(*argv);
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++argv;
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--argc;
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} else
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field_width = 0;
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} else {
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while (isdigit(*f)) {
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++f;
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++direc_length;
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}
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}
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if (*f == '.') {
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++f;
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++direc_length;
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if (*f == '*') {
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++f;
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++direc_length;
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if (argc > 0) {
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precision = my_xstrtoul(*argv);
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++argv;
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--argc;
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} else
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precision = 0;
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} else
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while (isdigit(*f)) {
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++f;
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++direc_length;
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}
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}
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if (*f == 'l' || *f == 'L' || *f == 'h') {
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++f;
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++direc_length;
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}
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/*
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if (!strchr ("diouxXfeEgGcs", *f))
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fprintf(stderr, "%%%c: invalid directive", *f);
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*/
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++direc_length;
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if (argc > 0) {
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print_direc(direc_start, direc_length, field_width,
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precision, *argv);
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++argv;
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--argc;
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} else
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print_direc(direc_start, direc_length, field_width,
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precision, "");
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break;
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case '\\':
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if (*++f == 'c')
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exit(0);
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putchar(bb_process_escape_sequence((const char **)&f));
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f--;
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break;
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default:
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putchar(*f);
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}
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}
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return save_argc - argc;
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}
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int printf_main(int argc, char **argv);
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int printf_main(int argc, char **argv)
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{
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char *format;
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int args_used;
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if (argc <= 1 || argv[1][0] == '-') {
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bb_show_usage();
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}
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format = argv[1];
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argc -= 2;
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argv += 2;
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do {
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args_used = print_formatted(format, argc, argv);
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argc -= args_used;
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argv += args_used;
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} while (args_used > 0 && argc > 0);
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/* if (argc > 0)
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fprintf(stderr, "excess args ignored");
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*/
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return EXIT_SUCCESS;
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}
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