/* vi: set sw=4 ts=4: */ /* printf - format and print data Copyright 1999 Dave Cinege Portions copyright (C) 1990-1996 Free Software Foundation, Inc. Licensed under GPL v2 or later, see file LICENSE in this tarball for details. */ /* 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> */ // 19990508 Busy Boxed! Dave Cinege #include <unistd.h> #include <stdio.h> #include <sys/types.h> #include <string.h> #include <errno.h> #include <stdlib.h> #include <fcntl.h> #include <ctype.h> #include <assert.h> #include "busybox.h" static int print_formatted (char *format, int argc, char **argv); static void print_direc (char *start, size_t length, int field_width, int precision, char *argument); typedef int (*converter)(char *arg, void *result); static void multiconvert(char *arg, void *result, converter convert) { char s[16]; if (*arg == '"' || *arg == '\'') { sprintf(s,"%d",(unsigned)*(++arg)); arg=s; } if(convert(arg,result)) fprintf(stderr, "%s", arg); } static unsigned long xstrtoul(char *arg) { unsigned long result; multiconvert(arg,&result, (converter)safe_strtoul); return result; } static long xstrtol(char *arg) { long result; multiconvert(arg, &result, (converter)safe_strtol); return result; } static double xstrtod(char *arg) { double result; multiconvert(arg, &result, (converter)safe_strtod); return result; } static void print_esc_string(char *str) { for (; *str; str++) { if (*str == '\\') { str++; putchar(bb_process_escape_sequence((const char **)&str)); } else { putchar(*str); } } } int printf_main(int argc, char **argv) { char *format; int args_used; if (argc <= 1 || **(argv + 1) == '-') { bb_show_usage(); } 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); /* if (argc > 0) fprintf(stderr, "excess args ignored"); */ return EXIT_SUCCESS; } /* Print the text in FORMAT, using ARGV (with ARGC elements) for arguments to any `%' directives. Return the number of elements of ARGV used. */ static int print_formatted(char *format, int argc, char **argv) { int save_argc = argc; /* Preserve original value. */ char *f; /* Pointer into `format'. */ char *direc_start; /* Start of % directive. */ size_t 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 (strchr("-+ #", *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 (!strchr ("diouxXfeEgGcs", *f)) fprintf(stderr, "%%%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 '\\': if (*++f == 'c') exit(0); putchar(bb_process_escape_sequence((const char **)&f)); f--; break; default: putchar(*f); } } return save_argc - argc; } static void print_direc(char *start, size_t 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); }