+/* vi: set sw=4 ts=4: */
/*
* Mini more implementation for busybox
*
#include <fcntl.h>
#include <signal.h>
#include <sys/ioctl.h>
+#define BB_DECLARE_EXTERN
+#define bb_need_help
+#include "messages.c"
-static const char more_usage[] = "more [file ...]\n";
+static const char more_usage[] = "more [FILE ...]\n"
+#ifndef BB_FEATURE_TRIVIAL_HELP
+ "\nMore is a filter for viewing FILE one screenful at a time.\n"
+#endif
+ ;
/* ED: sparc termios is broken: revert back to old termio handling. */
#ifdef BB_FEATURE_USE_TERMIOS
#if #cpu(sparc)
-# define USE_OLD_TERMIO
# include <termio.h>
# define termios termio
-# define stty(fd,argp) ioctl(fd,TCSETAF,argp)
+# define setTermSettings(fd,argp) ioctl(fd,TCSETAF,argp)
+# define getTermSettings(fd,argp) ioctl(fd,TCGETA,argp)
#else
# include <termios.h>
-# define stty(fd,argp) tcsetattr(fd,TCSANOW,argp)
+# define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
+# define getTermSettings(fd,argp) tcgetattr(fd, argp);
#endif
- FILE *cin;
- struct termios initial_settings, new_settings;
+FILE *cin;
+
+struct termios initial_settings, new_settings;
- void gotsig(int sig) {
- stty(fileno(cin), &initial_settings);
- fprintf(stdout, "\n");
- exit( TRUE);
- }
+void gotsig(int sig)
+{
+ setTermSettings(fileno(cin), &initial_settings);
+ fprintf(stdout, "\n");
+ exit(TRUE);
+}
#endif
-#define TERMINAL_WIDTH 79 /* not 80 in case terminal has linefold bug */
+#define TERMINAL_WIDTH 79 /* not 80 in case terminal has linefold bug */
#define TERMINAL_HEIGHT 24
#if defined BB_FEATURE_AUTOWIDTH
-static int terminal_width = 0, terminal_height = 0;
+#ifdef BB_FEATURE_USE_TERMIOS
+static int terminal_width = TERMINAL_WIDTH;
+#endif
+static int terminal_height = TERMINAL_HEIGHT;
#else
#define terminal_width TERMINAL_WIDTH
#define terminal_height TERMINAL_HEIGHT
extern int more_main(int argc, char **argv)
{
- int c, lines=0, input=0;
- int next_page=0;
- struct stat st;
- FILE *file;
-#ifdef BB_FEATURE_AUTOWIDTH
- struct winsize win = {0,0};
-#endif
+ int c, lines = 0, input = 0;
+ int please_display_more_prompt = 0;
+ struct stat st;
+ FILE *file;
- argc--;
- argv++;
+#if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
+ struct winsize win = { 0, 0 };
+#endif
- if ( argc > 0 && (strcmp(*argv,"--help")==0 || strcmp(*argv,"-h")==0) ) {
- usage (more_usage);
- }
- do {
- if (argc==0) {
- file = stdin;
- }
- else
- file = fopen(*argv, "r");
+ argc--;
+ argv++;
- if (file == NULL) {
- perror(*argv);
- exit(FALSE);
+ if (argc > 0
+ && (strcmp(*argv, dash_dash_help) == 0 || strcmp(*argv, "-h") == 0)) {
+ usage(more_usage);
}
- fstat(fileno(file), &st);
+ do {
+ if (argc == 0) {
+ file = stdin;
+ } else
+ file = fopen(*argv, "r");
+
+ if (file == NULL) {
+ perror(*argv);
+ exit(FALSE);
+ }
+ fstat(fileno(file), &st);
#ifdef BB_FEATURE_USE_TERMIOS
- cin = fopen("/dev/tty", "r");
- if (!cin)
- cin = fopen("/dev/console", "r");
-#ifdef USE_OLD_TERMIO
- ioctl(fileno(cin),TCGETA,&initial_settings);
-#else
- tcgetattr(fileno(cin),&initial_settings);
-#endif
- new_settings = initial_settings;
- new_settings.c_lflag &= ~ICANON;
- new_settings.c_lflag &= ~ECHO;
- stty(fileno(cin), &new_settings);
-
-#ifdef BB_FEATURE_AUTOWIDTH
- ioctl(fileno(stdout), TIOCGWINSZ, &win);
- if (win.ws_row > 4)
- terminal_height = win.ws_row - 2;
- if (win.ws_col > 0)
- terminal_width = win.ws_col - 1;
+ cin = fopen("/dev/tty", "r");
+ if (!cin)
+ cin = fopen("/dev/console", "r");
+ getTermSettings(fileno(cin), &initial_settings);
+ new_settings = initial_settings;
+ new_settings.c_cc[VMIN] = 1;
+ new_settings.c_cc[VTIME] = 0;
+ new_settings.c_lflag &= ~ICANON;
+ new_settings.c_lflag &= ~ECHO;
+ setTermSettings(fileno(cin), &new_settings);
+
+#ifdef BB_FEATURE_AUTOWIDTH
+ ioctl(fileno(stdout), TIOCGWINSZ, &win);
+ if (win.ws_row > 4)
+ terminal_height = win.ws_row - 2;
+ if (win.ws_col > 0)
+ terminal_width = win.ws_col - 1;
#endif
- (void) signal(SIGINT, gotsig);
- (void) signal(SIGQUIT, gotsig);
- (void) signal(SIGTERM, gotsig);
+ (void) signal(SIGINT, gotsig);
+ (void) signal(SIGQUIT, gotsig);
+ (void) signal(SIGTERM, gotsig);
#endif
- while ((c = getc(file)) != EOF) {
- if ( next_page ) {
- int len=0;
- next_page = 0;
- lines=0;
- len = fprintf(stdout, "--More-- ");
- if (file != stdin) {
- len += fprintf(stdout, "(%d%% of %ld bytes)",
- (int) (100*( (double) ftell(file) / (double) st.st_size )),
- st.st_size);
- }
- len += fprintf(stdout, "%s",
+ while ((c = getc(file)) != EOF) {
+ if (please_display_more_prompt) {
+ int len = 0;
+
+ please_display_more_prompt = 0;
+ lines = 0;
+ len = fprintf(stdout, "--More-- ");
+ if (file != stdin) {
+ len += fprintf(stdout, "(%d%% of %ld bytes)",
+ (int) (100 *
+ ((double) ftell(file) /
+ (double) st.st_size)),
+ st.st_size);
+ }
+ len += fprintf(stdout, "%s",
#ifdef BB_FEATURE_USE_TERMIOS
- ""
+ ""
#else
- "\n"
+ "\n"
#endif
- );
+ );
- fflush(stdout);
- input = getc( cin);
+ fflush(stdout);
+ /*
+ * We've just displayed the "--More--" prompt, so now we need
+ * to get input from the user.
+ */
#ifdef BB_FEATURE_USE_TERMIOS
- /* Erase the "More" message */
- while(--len >= 0)
- putc('\b', stdout);
- while(++len <= terminal_width)
- putc(' ', stdout);
- while(--len >= 0)
- putc('\b', stdout);
- fflush(stdout);
+ input = getc(cin);
+#else
+ input = getc(stdin);
+#endif
+
+#ifdef BB_FEATURE_USE_TERMIOS
+ /* Erase the "More" message */
+ while (--len >= 0)
+ putc('\b', stdout);
+ while (++len <= terminal_width)
+ putc(' ', stdout);
+ while (--len >= 0)
+ putc('\b', stdout);
+ fflush(stdout);
#endif
- }
- if (c == '\n' ) {
- switch(input) {
- case 'q':
- goto end;
- case '\n':
- /* increment by just one line if we are at
- * the end of this line*/
- next_page = 1;
- break;
+ }
+
+ /*
+ * There are two input streams to worry about here:
+ *
+ * c : the character we are reading from the file being "mored"
+ * input : a character received from the keyboard
+ *
+ * If we hit a newline in the _file_ stream, we want to test and
+ * see if any characters have been hit in the _input_ stream. This
+ * allows the user to quit while in the middle of a file.
+ */
+ if (c == '\n') {
+ switch (input) {
+ case 'q':
+ goto end;
+ case '\n':
+ /* increment by just one line if we are at
+ * the end of this line*/
+ please_display_more_prompt = 1;
+ break;
+ }
+ if (++lines == terminal_height)
+ please_display_more_prompt = 1;
+ }
+ /* If any key other than a return is hit, scroll by one page */
+ putc(c, stdout);
}
- if ( ++lines == terminal_height )
- next_page = 1;
- }
- putc(c, stdout);
- }
- fclose(file);
- fflush(stdout);
+ fclose(file);
+ fflush(stdout);
- argv++;
- } while (--argc > 0);
-end:
+ argv++;
+ } while (--argc > 0);
+ end:
#ifdef BB_FEATURE_USE_TERMIOS
- gotsig(0);
-#endif
- exit(TRUE);
+ gotsig(0);
+#endif
+ return(TRUE);
}
-
projects / oweals / busybox.git / blobdiff