/* char_io.c - basic console input and output */ /* * GRUB -- GRand Unified Bootloader * Copyright (C) 1996 Erich Boleyn * Copyright (C) 1999 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 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 "shared.h" void print_error (void) { if (errnum > ERR_NONE && errnum < MAX_ERR_NUM) #ifndef STAGE1_5 /* printf("\7\n %s\n", err_list[errnum]); */ printf ("\nError: %s\n", err_list[errnum]); #else /* STAGE1_5 */ printf ("Error: %u\n", errnum); #endif /* STAGE1_5 */ } char * convert_to_ascii (char *buf, int c,...) { unsigned long num = *((&c) + 1), mult = 10; char *ptr = buf; #ifndef STAGE1_5 if (c == 'x') mult = 16; if ((num & 0x80000000uL) && c == 'd') { num = (~num) + 1; *(ptr++) = '-'; buf++; } #endif do { int dig = num % mult; *(ptr++) = ((dig > 9) ? dig + 'a' - 10 : '0' + dig); } while (num /= mult); /* reorder to correct direction!! */ { char *ptr1 = ptr - 1; char *ptr2 = buf; while (ptr1 > ptr2) { int c = *ptr1; *ptr1 = *ptr2; *ptr2 = c; ptr1--; ptr2++; } } return ptr; } void grub_printf (const char *format,...) { int *dataptr = (int *) &format; char c, *ptr, str[16]; dataptr++; while ((c = *(format++)) != 0) { if (c != '%') putchar (c); else switch (c = *(format++)) { #ifndef STAGE1_5 case 'd': case 'x': #endif case 'u': *convert_to_ascii (str, c, *((unsigned long *) dataptr++)) = 0; ptr = str; while (*ptr) putchar (*(ptr++)); break; #ifndef STAGE1_5 case 'c': putchar ((*(dataptr++)) & 0xff); break; case 's': ptr = (char *) (*(dataptr++)); while ((c = *(ptr++)) != 0) putchar (c); break; #endif } } } #ifndef STAGE1_5 int grub_sprintf (char *buffer, const char *format, ...) { /* XXX hohmuth ugly hack -- should unify with printf() */ int *dataptr = (int *) &format; char c, *ptr, str[16]; char *bp = buffer; dataptr++; while ((c = *format++) != 0) { if (c != '%') *bp++ = c; /* putchar(c); */ else switch (c = *(format++)) { case 'd': case 'u': case 'x': *convert_to_ascii (str, c, *((unsigned long *) dataptr++)) = 0; ptr = str; while (*ptr) *bp++ = *(ptr++); /* putchar(*(ptr++)); */ break; case 'c': *bp++ = (*(dataptr++))&0xff; /* putchar((*(dataptr++))&0xff); */ break; case 's': ptr = (char *) (*(dataptr++)); while ((c = *ptr++) != 0) *bp++ = c; /* putchar(c); */ break; } } *bp = 0; return bp - buffer; } void init_page (void) { cls (); printf ("\n GRUB version %s (%dK lower / %dK upper memory)\n\n", version_string, mbi.mem_lower, mbi.mem_upper); } /* The number of the history entries. */ static int num_history = 0; /* Get the NOth history. If NO is less than zero or greater than or equal to NUM_HISTORY, return NULL. Otherwise return a valid string. */ static char * get_history (int no) { if (no < 0 || no >= num_history) return 0; return (char *) HISTORY_BUF + MAX_CMDLINE * no; } /* Add CMDLINE to the history buffer. */ static void add_history (const char *cmdline, int no) { grub_memmove ((char *) HISTORY_BUF + MAX_CMDLINE * (no + 1), (char *) HISTORY_BUF + MAX_CMDLINE * no, MAX_CMDLINE * (num_history - no)); grub_strcpy ((char *) HISTORY_BUF + MAX_CMDLINE * no, cmdline); if (num_history < HISTORY_SIZE) num_history++; } /* Don't use this with a MAXLEN greater than 1600 or so! The problem is that GET_CMDLINE depends on the everything fitting on the screen at once. So, the whole screen is about 2000 characters, minus the PROMPT, and space for error and status lines, etc. MAXLEN must be at least 1, and PROMPT and CMDLINE must be valid strings (not NULL or zero-length). If ECHO_CHAR is nonzero, echo it instead of the typed character. */ int get_cmdline (char *prompt, char *cmdline, int maxlen, int echo_char, int readline) { int ystart, yend, xend, lpos, c; /* The length of PROMPT. */ int plen = 0; /* The length of the command-line. */ int llen = 0; /* The index for the history. */ int history = -1; /* The working buffer for the command-line. */ char *buf = (char *) CMDLINE_BUF; /* The kill buffer. */ char *kill = (char *) KILL_BUF; /* nested function definition for code simplicity */ static void cl_print (char *str, int echo_char) { while (*str != 0) { putchar (echo_char ? echo_char : *str); str++; if (++xend > 78) { xend = 0; putchar (' '); if (yend == (getxy () & 0xff)) ystart--; else yend++; } } } /* nested function definition for code simplicity */ static void cl_setcpos (void) { yend = ((lpos + plen) / 79) + ystart; xend = ((lpos + plen) % 79); gotoxy (xend, yend); } /* nested function definition for initial command-line printing */ static void cl_init () { /* distinguish us from other lines and error messages! */ putchar ('\n'); /* print full line and set position here */ ystart = (getxy () & 0xff); yend = ystart; xend = 0; cl_print (prompt, 0); cl_print (buf, echo_char); cl_setcpos (); } /* nested function definition for erasing to the end of the line */ static void cl_kill_to_end () { int i; buf[lpos] = 0; for (i = lpos; i <= llen; i++) { if (i && ((i + plen) % 79) == 0) putchar (' '); putchar (' '); } llen = lpos; cl_setcpos (); } static void cl_insert (const char *str) { int l = grub_strlen (str); if (llen + l < maxlen) { if (lpos == llen) { grub_memmove (buf + lpos, str, l + 1); cl_setcpos (); cl_print (buf + lpos, echo_char); lpos += l; cl_setcpos (); } else { grub_memmove (buf + lpos + l, buf + lpos, llen - lpos + 1); grub_memmove (buf + lpos, str, l); cl_setcpos (); cl_print (buf + lpos, echo_char); lpos += l; cl_setcpos (); } llen += l; } } plen = grub_strlen (prompt); llen = grub_strlen (cmdline); if (maxlen > MAX_CMDLINE) { maxlen = MAX_CMDLINE; if (llen >= MAX_CMDLINE) { llen = MAX_CMDLINE - 1; cmdline[MAX_CMDLINE] = 0; } } lpos = llen; grub_strcpy (buf, cmdline); cl_init (); while (ASCII_CHAR (c = getkey ()) != '\n' && ASCII_CHAR (c) != '\r') { switch (c) { case KEY_LEFT: c = 2; break; case KEY_RIGHT: c = 6; break; case KEY_UP: c = 16; break; case KEY_DOWN: c = 14; break; case KEY_HOME: c = 1; break; case KEY_END: c = 5; break; case KEY_DC: c = 4; break; case KEY_BACKSPACE: c = 8; break; } c = ASCII_CHAR (c); /* If READLINE is non-zero, handle readline-like key bindings. */ if (readline) { switch (c) { case 9: /* TAB lists completions */ { int i; /* POS points to the first space after a command. */ int pos = 0; int ret; char *completion_buffer = (char *) COMPLETION_BUF; int equal_pos = -1; int is_filename; /* Find the first word. */ while (buf[pos] == ' ') pos++; while (buf[pos] && buf[pos] != '=' && buf[pos] != ' ') pos++; is_filename = (lpos > pos); /* Find the position of the equal character after a command, and replace it with a space. */ for (i = pos; buf[i] && buf[i] != ' '; i++) if (buf[i] == '=') { equal_pos = i; buf[i] = ' '; break; } /* Find the position of the first character in this word. */ for (i = lpos; i > 0 && buf[i - 1] != ' '; i--) ; /* Copy this word to COMPLETION_BUFFER and do the completion. */ grub_memmove (completion_buffer, buf + i, lpos - i); completion_buffer[lpos - i] = 0; ret = print_completions (is_filename, 1); errnum = ERR_NONE; if (ret >= 0) { /* Found, so insert COMPLETION_BUFFER. */ cl_insert (completion_buffer + lpos - i); if (ret > 0) { /* There is more than one candidates, so print the list. */ /* Go to the part after the line here. */ yend = ((llen + plen) / 79) + ystart; grub_putchar ('\n'); gotoxy (0, getxy () & 0xff); print_completions (is_filename, 0); errnum = ERR_NONE; } } /* Restore the command-line. */ if (equal_pos >= 0) buf[equal_pos] = '='; if (ret) cl_init (); } break; case 1: /* C-a go to beginning of line */ lpos = 0; cl_setcpos (); break; case 5: /* C-e go to end of line */ lpos = llen; cl_setcpos (); break; case 6: /* C-f forward one character */ if (lpos < llen) { lpos++; cl_setcpos (); } break; case 2: /* C-b backward one character */ if (lpos > 0) { lpos--; cl_setcpos (); } break; case 21: /* C-u kill to beginning of line */ if (lpos == 0) break; /* Copy the string being deleted to KILL. */ grub_memmove (kill, buf, lpos); kill[lpos] = 0; grub_memmove (buf, buf + lpos, llen - lpos + 1); lpos = llen - lpos; cl_setcpos (); cl_kill_to_end (); lpos = 0; cl_setcpos (); cl_print (buf, echo_char); cl_setcpos (); break; case 11: /* C-k kill to end of line */ if (lpos == llen) break; /* Copy the string being deleted to KILL. */ grub_memmove (kill, buf + lpos, llen - lpos + 1); cl_kill_to_end (); break; case 25: /* C-y yank the kill buffer */ cl_insert (kill); break; case 16: /* C-p fetch the previous command */ { char *p; if (history < 0) /* Save the working buffer. */ grub_strcpy (cmdline, buf); else if (grub_strcmp (get_history (history), buf) != 0) /* If BUF is modified, add it into the history list. */ add_history (buf, history); history++; p = get_history (history); if (! p) { history--; break; } lpos = 0; cl_setcpos (); cl_kill_to_end (); grub_strcpy (buf, p); llen = grub_strlen (buf); lpos = llen; cl_print (buf, 0); cl_setcpos (); } break; case 14: /* C-n fetch the next command */ { char *p; if (history < 0) { break; } else if (grub_strcmp (get_history (history), buf) != 0) /* If BUF is modified, add it into the history list. */ add_history (buf, history); history--; p = get_history (history); if (! p) p = cmdline; lpos = 0; cl_setcpos (); cl_kill_to_end (); grub_strcpy (buf, p); llen = grub_strlen (buf); lpos = llen; cl_print (buf, 0); cl_setcpos (); } break; } } /* ESC, C-d and C-h are always handled. Actually C-d is not functional if READLINE is zero, as the cursor cannot go backward, but that's ok. */ switch (c) { case 27: /* ESC immediately return 1 */ return 1; case 4: /* C-d delete character under cursor */ if (lpos == llen) break; lpos++; /* fallthrough is on purpose! */ case 8: /* C-h backspace */ #ifdef GRUB_UTIL case 127: /* also backspace */ #endif if (lpos > 0) { int i; grub_memmove (buf + lpos - 1, buf + lpos, llen - lpos + 1); i = lpos; lpos = llen - 1; cl_setcpos (); putchar (' '); lpos = i - 1; /* restore lpos and decrement */ llen--; cl_setcpos (); if (lpos != llen) { cl_print (buf + lpos, echo_char); cl_setcpos (); } } break; default: /* insert printable character into line */ if (c >= ' ' && c <= '~') { char str[2]; str[0] = c; str[1] = 0; cl_insert (str); } } } /* Move the cursor to the end of the command. */ lpos = llen; cl_setcpos (); grub_putchar ('\n'); gotoxy (0, getxy () & 0xff); /* If ECHO_CHAR is NUL, remove the leading spaces. */ lpos = 0; if (! echo_char) while (buf[lpos] == ' ') lpos++; /* Copy the working buffer to CMDLINE. */ grub_memmove (cmdline, buf + lpos, llen - lpos + 1); /* If the readline-like feature is turned on and CMDLINE is not empty, add it into the history list. */ if (readline && lpos < llen) add_history (cmdline, 0); return 0; } #endif /* STAGE1_5 */ int safe_parse_maxint (char **str_ptr, int *myint_ptr) { char *ptr = *str_ptr; int myint = 0; int mult = 10, found = 0; /* * Is this a hex number? */ if (*ptr == '0' && tolower (*(ptr + 1)) == 'x') { ptr += 2; mult = 16; } while (1) { /* A bit tricky. This below makes use of the equivalence: (A >= B && A <= C) <=> ((A - B) <= (C - B)) when C > B and A is unsigned. */ unsigned int digit; digit = tolower (*ptr) - '0'; if (digit > 9) { digit -= 'a' - '0'; if (mult == 10 || digit > 5) break; digit += 10; } found = 1; if (myint > ((MAXINT - digit) / mult)) { errnum = ERR_NUMBER_PARSING; return 0; } myint = (myint * mult) + digit; ptr++; } if (!found) { errnum = ERR_NUMBER_PARSING; return 0; } *str_ptr = ptr; *myint_ptr = myint; return 1; } int grub_tolower (int c) { if (c >= 'A' && c <= 'Z') return (c + ('a' - 'A')); return c; } int grub_isspace (int c) { if (c == ' ' || c == '\t' || c == '\n') return 1; return 0; } #ifndef STAGE1_5 int grub_memcmp (const char *s1, const char *s2, int n) { while (n) { if (*s1 < *s2) return -1; else if (*s1 > *s2) return 1; s1++; s2++; n--; } return 0; } int grub_strncat (char *s1, const char *s2, int n) { int i = -1; while (++i < n && s1[i] != 0); while (i < n && (s1[i++] = *(s2++)) != 0); s1[n - 1] = 0; if (i >= n) return 0; s1[i] = 0; return 1; } int grub_strcmp (const char *s1, const char *s2) { while (*s1 || *s2) { if (*s1 < *s2) return -1; else if (*s1 > *s2) return 1; s1 ++; s2 ++; } return 0; } #endif /* ! STAGE1_5 */ int substring (char *s1, char *s2) { while (*s1 == *s2) { /* The strings match exactly. */ if (! *(s1++)) return 0; s2 ++; } /* S1 is a substring of S2. */ if (*s1 == 0) return -1; /* S1 isn't a substring. */ return 1; } #ifndef STAGE1_5 /* Terminate the string STR with NUL. */ char * nul_terminate (char *str) { while (*str && ! grub_isspace (*str)) str++; *str++ = 0; return str; } char * grub_strstr (const char *s1, const char *s2) { const char *ptr, *tmp; while (*s1) { ptr = s1; tmp = s2; while (*s1 && *s1++ == *tmp++); if (tmp > s2 && !*(tmp - 1)) return (char *) ptr; } return 0; } int grub_strlen (const char *str) { int len = 0; while (*str++) len++; return len; } #endif /* ! STAGE1_5 */ int memcheck (int addr, int len) { #ifdef GRUB_UTIL static int start_addr (void) { int ret; # if defined(HAVE_START_SYMBOL) asm volatile ("movl $start, %0" : "=a" (ret)); # elif defined(HAVE_USCORE_START_SYMBOL) asm volatile ("movl $_start, %0" : "=a" (ret)); # endif return ret; } static int end_addr (void) { int ret; # if defined(HAVE_END_SYMBOL) asm volatile ("movl $end, %0" : "=a" (ret)); # elif defined(HAVE_USCORE_END_SYMBOL) asm volatile ("movl $_end, %0" : "=a" (ret)); # endif return ret; } if (start_addr () <= addr && end_addr () > addr + len) return ! errnum; #endif /* GRUB_UTIL */ if ((addr < RAW_ADDR (0x1000)) || (addr < RAW_ADDR (0x100000) && RAW_ADDR (mbi.mem_lower * 1024) < (addr + len)) || (addr >= RAW_ADDR (0x100000) && RAW_ADDR (mbi.mem_upper * 1024) < ((addr - 0x100000) + len))) errnum = ERR_WONT_FIT; return ! errnum; } char * grub_memmove (char *to, const char *from, int len) { if (memcheck ((int) to, len)) { /* This assembly code is stolen from linux-2.2.2/include/asm-i386/string.h. This is not very fast but compact. */ int d0, d1, d2; if (to < from) { asm volatile ("cld\n\t" "rep\n\t" "movsb" : "=&c" (d0), "=&S" (d1), "=&D" (d2) : "0" (len),"1" (from),"2" (to) : "memory"); } else { asm volatile ("std\n\t" "rep\n\t" "movsb\n\t" "cld" : "=&c" (d0), "=&S" (d1), "=&D" (d2) : "0" (len), "1" (len - 1 + from), "2" (len - 1 + to) : "memory"); } } return errnum ? NULL : to; } #ifndef STAGE1_5 void * grub_memset (void *start, int c, int len) { char *p = start; if (memcheck ((int) start, len)) { while (len -- > 0) *p ++ = c; } return errnum ? NULL : start; } char * grub_strcpy (char *dest, const char *src) { grub_memmove (dest, src, grub_strlen (src) + 1); return dest; } #endif /* ! STAGE1_5 */