diff options
Diffstat (limited to 'contrib/syslinux-4.02/com32/cmenu/libmenu/help.c')
| -rw-r--r-- | contrib/syslinux-4.02/com32/cmenu/libmenu/help.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/cmenu/libmenu/help.c b/contrib/syslinux-4.02/com32/cmenu/libmenu/help.c new file mode 100644 index 0000000..0df1e10 --- /dev/null +++ b/contrib/syslinux-4.02/com32/cmenu/libmenu/help.c @@ -0,0 +1,232 @@ +/* -*- c -*- ------------------------------------------------------------- * + * + * Copyright 2004-2005 Murali Krishnan Ganapathy - All Rights Reserved + * + * 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, Inc., 53 Temple Place Ste 330, + * Boston MA 02111-1307, USA; either version 2 of the License, or + * (at your option) any later version; incorporated herein by reference. + * + * ----------------------------------------------------------------------- */ + +#include "help.h" +#include <stdio.h> +#include "string.h" +#include "com32io.h" +#include <syslinux/loadfile.h> // to read entire file into memory + +int nc, nr; // Number of columns/rows of the screen +char helpbasedir[HELPDIRLEN]; // name of help directory limited to HELPDIRLEN + +// Find the occurence of the count'th \n in buffer (or NULL) if not found +static char *findline(char *buffer, int count) +{ + int ctr; + char *p = buffer - 1; + + if (count < 1) + return buffer; + for (ctr = 0; ctr < count; ctr++) { + p = strchr(p + 1, '\n'); + if (p == NULL) + return NULL; + } + return p; +} + +// return the number of lines in buffer +static int countlines(char *buffer) +{ + int ans; + const char *p; + + p = buffer - 1; + ans = 1; + while (p) { + p = strchr(p + 1, '\n'); + ans++; + } + return ans; +} + +// Print numlines of text starting from buf +static void printtext(char *buf, int from) +{ + char *f, *t; + int right, nlines, i; + + // clear window to print + right = nc - HELP_RIGHT_MARGIN; + nlines = nr - HELP_BODY_ROW - HELP_BOTTOM_MARGIN - 1; + + f = findline(buf, from); + if (!f) + return; // nothing to print + if (*f == '\n') + f++; // start of from+1st line + t = f; + while (i < nlines) { + gotoxy(HELP_BODY_ROW + i, HELP_LEFT_MARGIN); + clear_end_of_line(); + putchar(SO); + gotoxy(HELP_BODY_ROW + i, nc - 1); + putch(LEFT_BORDER, 0x07); + putchar(SI); + + gotoxy(HELP_BODY_ROW + i, HELP_LEFT_MARGIN); + while (*t != '\n') { + if (*t == '\0') + return; + putchar(*t); + t++; + } + putchar('\n'); + t++; + i++; + } +} + +void showhelp(const char *filename) +{ + char ph; + char *title, *text; + union { + char *buffer; + void *vbuf; + } buf; // This is to avoild type-punning issues + + char line[512]; + size_t size; + int scan; + int rv, numlines, curr_line; + + if (getscreensize(1, &nr, &nc)) { + /* Unknown screen size? */ + nc = 80; + nr = 24; + } + ph = nr - HELP_BODY_ROW; + cls(); + + /* Turn autowrap off, to avoid scrolling the menu */ + printf(CSI "?7l"); + + if (filename == NULL) { // print file contents + strcpy(line, "Filename not given"); + goto puke; + } + + rv = loadfile(filename, (void **)&buf.vbuf, &size); // load entire file into memory + if (rv < 0) { // Error reading file or no such file + sprintf(line, "Error reading file or file not found\n file=%s", filename); + goto puke; + } + + title = buf.buffer; + text = findline(title, 1); // end of first line + *text++ = '\0'; // end the title string and increment text + + // Now we have a file just print it. + numlines = countlines(text); + curr_line = 0; + scan = KEY_ESC + 1; // anything except ESCAPE + + /* top, left, bottom, right, attr */ + drawbox(0, 0, nr - 1, nc - 1, 0x07); + while (scan != KEY_ESC) { + /* Title */ + gotoxy(1, (nc - strlen(title)) / 2); + fputs(title, stdout); + drawhorizline(2, HELP_LEFT_MARGIN - 1, nc - HELP_RIGHT_MARGIN, 0x07, 0); // dumb==0 + /* Text */ + printtext(text, curr_line); + gotoxy(HELP_BODY_ROW - 1, nc - HELP_RIGHT_MARGIN); + if (curr_line > 0) + putchar(HELP_MORE_ABOVE); + else + putchar(' '); + gotoxy(nr - HELP_BOTTOM_MARGIN - 1, nc - HELP_RIGHT_MARGIN); + if (curr_line < numlines - ph) + putchar(HELP_MORE_BELOW); + else + putchar(' '); + + scan = get_key(stdout, 0); // wait for user keypress + + switch (scan) { + case KEY_HOME: + curr_line = 0; + break; + case KEY_END: + curr_line = numlines; + break; + case KEY_UP: + curr_line--; + break; + case KEY_DOWN: + curr_line++; + break; + case KEY_PGUP: + curr_line -= ph; + break; + case KEY_PGDN: + curr_line += ph; + break; + default: + break; + } + if (curr_line > numlines - ph) + curr_line = numlines - ph; + if (curr_line < 0) + curr_line = 0; + } +out: + cls(); + return; + +puke: + gotoxy(HELP_BODY_ROW, HELP_LEFT_MARGIN); + fputs(line, stdout); + while (1) { + scan = get_key(stdin, 0); + if (scan == KEY_ESC) + break; + } + goto out; +} + +void runhelp(const char *filename) +{ + char fullname[HELPDIRLEN + 16]; + + cls(); + cursoroff(); + if (helpbasedir[0] != 0) { + strcpy(fullname, helpbasedir); + strcat(fullname, "/"); + strcat(fullname, filename); + showhelp(fullname); + } else + showhelp(filename); // Assume filename is absolute +} + +void runhelpsystem(unsigned int helpid) +{ + char filename[15]; + + sprintf(filename, "hlp%05d.txt", helpid); + runhelp(filename); +} + +void init_help(const char *helpdir) +{ + if (helpdir != NULL) + strcpy(helpbasedir, helpdir); + else + helpbasedir[0] = 0; +} + +void close_help(void) +{ +} |