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<pre class="sourcecodebox">/*
dru_progress.c
Part of the Disc Recording Utility sources for command-line tools. This
code provides utility functions for handling progress bars.
*/
#include <DiscRecording/DiscRecording.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/ttycom.h>
#include <math.h>
#include "dru_progress.h"
#define MAX_PROGRESS_WIDTH 80
void druTestProgressBar();
void druWinch(int signal);
typedef struct druProgress druProgress;
struct druProgress
{
char lastStage[100]; /* last stage that we were in */
char lineBuffer[MAX_PROGRESS_WIDTH]; /* the active line */
int lastPercent; /* last percentage we processed */
int newlineWhenStageCompletes; /* setting: print a newline when the stage completes? */
};
int druInstalledWinch = 0;
int druReceivedWinch = 0;
int druScreenWidth = 0;
int druTTY = -1;
#pragma mark -
/*
druTestProgressBar
Runs a test for the progress bar.
*/
void druTestProgressBar()
{
dru_progress_t bar = druProgressBarCreate();
int nlosc = 1;
float percent;
druProgressBarSetNewLineForEachStage(bar,nlosc);
for (percent = 0.0; percent <= 1.0; percent += 0.001)
{
druProgressBarUpdate(bar,"Preparing...",percent);
usleep(10000);
}
for (percent = 0.0; percent <= 1.0; percent += 0.001)
{
druProgressBarUpdate(bar,"Writing...",percent);
usleep(10000);
}
for (percent = 0.0; percent <= 1.0; percent += 0.001)
{
druProgressBarUpdate(bar,"Closing...",percent);
usleep(1000);
}
druProgressBarUpdate(bar,"Finishing up...",0);
druProgressBarDispose(bar,1);
printf("Test complete.\n");
}
#pragma mark -
/*
druProgressBarCreate
Creates a new, empty progress bar.
*/
dru_progress_t
druProgressBarCreate()
{
dru_progress_t bar = (dru_progress_t)calloc(sizeof(struct druProgress),1);
struct winsize size;
/* Install SIGWINCH handler so that we correctly handle window resizes. */
if (!druInstalledWinch)
{
druInstalledWinch = 1;
signal(SIGWINCH,druWinch);
}
/* Get the width of the screen. */
if (druTTY == -1)
druTTY = open("/dev/tty", O_RDONLY, 0);
if (ioctl(druTTY,TIOCGWINSZ,&size) == 0)
druScreenWidth = size.ws_col;
/* Set a few variables. */
druReceivedWinch = 0;
/* Return the progress bar. */
return bar;
}
/*
druProgressBarSetNewLineForEachStage
*/
void
druProgressBarSetNewLineForEachStage(dru_progress_t progress, int nl)
{
progress->newlineWhenStageCompletes = nl;
}
/*
druProgressBarGetNewLineForEachStage
*/
int
druProgressBarGetNewLineForEachStage(dru_progress_t progress)
{
return progress->newlineWhenStageCompletes;
}
/*
druProgressBarUpdate
*/
void
druProgressBarUpdate(dru_progress_t progress, const char *stage, float percentage)
{
int availableWidth = druScreenWidth;
char newLineBuffer[MAX_PROGRESS_WIDTH];
int stageLen = strlen(stage);
int percent = (int)(percentage * 100);
/* Handle stage changes. */
if (strcmp(stage,progress->lastStage))
{
if (progress->lastStage[0] == 0 && progress->lineBuffer[0] == 0)
{
/* This is the first stage. We don't need to do anything special for this. */
}
else
{
/* We just changed stages. Mark the previous stage as finished. */
druProgressBarUpdate(progress,progress->lastStage,1.0);
druProgressBarUpdate(progress,progress->lastStage,INFINITY);
/* If we've been told to generate a new line for each stage, do so. */
if (progress->newlineWhenStageCompletes)
{
printf("\n");
progress->lineBuffer[0] = 0;
}
}
/* Remember the new stage. */
strncpy(progress->lastStage,stage,sizeof(progress->lastStage));
progress->lastStage[sizeof(progress->lastStage)-1] = 0;
}
/* If we received a SIGWINCH, erase the current progress bar. */
if (druReceivedWinch)
{
struct winsize size;
druReceivedWinch = 0;
if (ioctl(druTTY,TIOCGWINSZ,&size) == 0)
druScreenWidth = size.ws_col;
printf("\r%*s\r", (int)strlen(progress->lineBuffer), "");
progress->lineBuffer[0] = 0;
fflush(stdout);
}
/* Figure out how much space is available now. */
if (availableWidth > MAX_PROGRESS_WIDTH)
availableWidth = MAX_PROGRESS_WIDTH;
/* Build a new line buffer. The first thing in it is the stage. */
strncpy(newLineBuffer,stage,availableWidth);
newLineBuffer[availableWidth-1] = 0;
/* Next, if we're exactly done, say so. We check for either the
special INFINITY param, or for a percentage that jumps from 0 to 100%. */
if (percentage > 10000 || (percent == 100 && progress->lastPercent == 0))
{
snprintf(&newLineBuffer[stageLen],availableWidth - stageLen," done.");
}
/* Otherwise add the progress bar and percentage. We only need to draw a
progress bar if the percentage is greater than zero. We treat negative
or zero progress as indeterminate. */
else if (percent > 0)
{
/* How much space is available? */
if (availableWidth - stageLen < 5)
{
/* No space for anything. */
}
else if (availableWidth - stageLen < 15)
{
/* Only enough space for a percentage. */
snprintf(&newLineBuffer[stageLen],availableWidth - stageLen," %d%% ", percent);
}
else
{
/* There's enough room for a progress bar and a percentage. */
int barTotalWidth = availableWidth - stageLen - 10;
int barFullWidth = (int)(barTotalWidth * percentage);
if (barFullWidth < 0) barFullWidth = 0;
if (barFullWidth > barTotalWidth) barFullWidth = barTotalWidth;
/* First fill in an empty progress bar. */
snprintf(&newLineBuffer[stageLen],availableWidth - stageLen," [%*s] %d%% ",
barTotalWidth, "", percent);
/* It's full of stars! */
while (barFullWidth > 0)
newLineBuffer[stageLen + 2 + --barFullWidth] = '*';
}
}
/* We've got our new line buffer. Now let's print out enough characters to
update it. To reduce flicker, we don't erase and redraw the entire line
every time; we just redraw what changed. */
if (strcmp(progress->lineBuffer,newLineBuffer))
{
unsigned int i,j;
/* Find the first changed character. */
for (i = 0; i < sizeof(newLineBuffer); ++i)
if (progress->lineBuffer[i] != newLineBuffer[i])
break;
/* Back up that many characters. */
j = strlen(progress->lineBuffer) - i;
while (j-- > 0)
printf("\b \b");
/* Print the rest of the line. */
printf("%s",&newLineBuffer[i]);
/* Remember the line as it now stands. */
strncpy(progress->lineBuffer,newLineBuffer,sizeof(progress->lineBuffer));
progress->lineBuffer[sizeof(progress->lineBuffer)-1] = 0;
/* Last but not least, flush the display. */
fflush(stdout);
/* If we just hit 100%, sleep for a half a second so that the user
sees it and feels a sense of closure, before we jump to the "done" state. */
if (percent == 100)
usleep(500000);
}
/* Remember the last percentage. */
progress->lastPercent = (percent > 0) ? percent:0;
}
/*
druProgressBarDispose
Disposes a progress bar, with an indicator of whether the progress bar is being
terminated with successfuls status or not. (Unsuccessful status means that
we leave the bar visible the the user.)
*/
void druProgressBarDispose(dru_progress_t progress, int success)
{
/* Close the current stage, if any. */
if (progress->lastStage[0] != 0 && success)
{
druProgressBarUpdate(progress,progress->lastStage,1.0);
druProgressBarUpdate(progress,progress->lastStage,INFINITY);
}
/* If we're doing a newline on stage changes, print a newline. Otherwise,
this counts as a stage change, so erase the progress if we're successful. */
if (progress->newlineWhenStageCompletes || !success)
printf("\n");
else if (!progress->newlineWhenStageCompletes && success)
{
printf("\r%*s\r", (int)strlen(progress->lineBuffer), "");
progress->lineBuffer[0] = 0;
fflush(stdout);
}
/* That's it - free our buffer and we're done. */
free(progress);
}
#pragma mark -
/*
druWinch
Signal handler, simply sets druReceivedWinch to true. The progress callback
will notice next time it draws.
*/
void
druWinch(int signal)
{
#pragma unused(signal)
druReceivedWinch = 1;
}
</pre>
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