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1 | + | #include <stdio.h> |
2 | #include <string.h> | |
3 | ||
4 | /* Only for the sleep, the progress bar code itself is standard C */ | |
5 | #include <unistd.h> | |
6 | ||
7 | typedef enum | |
8 | { | |
9 | false=0, | |
10 | true=!false | |
11 | } bool; | |
12 | ||
13 | typedef struct | |
14 | { | |
15 | /* Start delimiter (e.g. [ )*/ | |
16 | char StartDelimiter; | |
17 | /* End Delimiter (e.g. ] )*/ | |
18 | char EndDelimiter; | |
19 | /* Central block (e.g. = )*/ | |
20 | char Block; | |
21 | /* Last blocks, rotated at each refresh (typical value: - | / - \ | / ) */ | |
22 | char LastBlocks[10]; | |
23 | /* Used positions of LastBlocks */ | |
24 | size_t LastBlocksSize; | |
25 | /* LastBlocks index to be used next time */ | |
26 | size_t LastBlockIndex; | |
27 | /* Width of the progress bar (in characters) */ | |
28 | unsigned int Width; | |
29 | /* Maximum value of the progress bar */ | |
30 | double Max; | |
31 | /* True if we have to print also the percentage of the operation */ | |
32 | bool PrintPercentage; | |
33 | /* True if the bar must be redrawn; | |
34 | note that this must be just set to false before the first call, the function then will change it by itself. */ | |
35 | bool Update; | |
36 | } ProgressBarSettings; | |
37 | ||
38 | /* Prints/updates the progress bar */ | |
39 | void PrintProgressBar(double Pos, ProgressBarSettings * Settings); | |
40 | /* Inits the settings of the progress bar to the default values */ | |
41 | void DefaultProgressBar(ProgressBarSettings * Settings); | |
42 | ||
43 | int main() | |
44 | { | |
45 | int i; | |
46 | /* Init the bar settings */ | |
47 | ProgressBarSettings pbs; | |
48 | DefaultProgressBar(&pbs); | |
49 | pbs.Max=400; | |
50 | pbs.Width=60; | |
51 | printf("Progress: "); | |
52 | /* Show the empty bar */ | |
53 | PrintProgressBar(0,&pbs); | |
54 | for(i=0;i<=pbs.Max;i++) | |
55 | { | |
56 | /* Wait 25 msec */ | |
57 | usleep(25000); | |
58 | /* Update the progress bar */ | |
59 | PrintProgressBar(i,&pbs); | |
60 | } | |
61 | puts(" Done"); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | /* Inits the settings of the progress bar to the default values */ | |
66 | void DefaultProgressBar(ProgressBarSettings * Settings) | |
67 | { | |
68 | const char * defaultLastBlocks="-\\|/-\\|/"; | |
69 | Settings->StartDelimiter='['; | |
70 | Settings->EndDelimiter=']'; | |
71 | Settings->Block='='; | |
72 | strncpy(Settings->LastBlocks, defaultLastBlocks, sizeof(Settings->LastBlocks)); | |
73 | Settings->LastBlocksSize=strlen(defaultLastBlocks); | |
74 | if(Settings->LastBlocksSize>sizeof(Settings->LastBlocks)) | |
75 | Settings->LastBlocksSize=sizeof(Settings->LastBlocks); | |
76 | Settings->LastBlockIndex=0; | |
77 | Settings->PrintPercentage=true; | |
78 | Settings->Update=false; | |
79 | Settings->Max=100; | |
80 | Settings->Width=40; | |
81 | } | |
82 | ||
83 | /* Prints/updates the progress bar */ | |
84 | void PrintProgressBar(double Pos, ProgressBarSettings * Settings) | |
85 | { | |
86 | /* Blocks to print */ | |
87 | unsigned int printBlocks=(unsigned int)(Settings->Width*Pos/Settings->Max); | |
88 | /* Counter */ | |
89 | unsigned int counter; | |
90 | /* If we are updating an existing bar...*/ | |
91 | if(Settings->Update) | |
92 | { | |
93 | /* ... we get back to its first character to rewrite it... */ | |
94 | for(counter=Settings->Width+2+(Settings->PrintPercentage?5:0);counter;counter--) | |
95 | putchar('\b'); | |
96 | } | |
97 | else | |
98 | Settings->Update=true; /* next time we'll be updating it */ | |
99 | /* Print the first delimiter */ | |
100 | putchar(Settings->StartDelimiter); | |
101 | /* Reset the counter */ | |
102 | counter=Settings->Width; | |
103 | /* Print all the blocks except the last; in the meantime, we decrement the counter, so in the end we'll have | |
104 | the number of spaces to fill the bar */ | |
105 | for(;printBlocks>1;printBlocks--,counter--) | |
106 | putchar(Settings->Block); | |
107 | /* Print the last block; if the operation ended, use the normal block, otherwise the one for the last block */ | |
108 | putchar((Settings->Max==Pos)?Settings->Block:Settings->LastBlocks[Settings->LastBlockIndex]); | |
109 | /* At the next update we'll use the next last block */ | |
110 | Settings->LastBlockIndex=(Settings->LastBlockIndex+1)%Settings->LastBlocksSize; | |
111 | /* Another block was printed, decrement the counter */ | |
112 | counter--; | |
113 | /* Fill the rest of the bar with spaces */ | |
114 | for(;counter;counter--) | |
115 | putchar(' '); | |
116 | /* Print the end delimiter */ | |
117 | putchar(Settings->EndDelimiter); | |
118 | /* If asked, print also the percentage */ | |
119 | if(Settings->PrintPercentage) | |
120 | printf(" %3d%%",(int)(100*Pos/Settings->Max)); | |
121 | /* Flush the output buffer */ | |
122 | fflush(stdout); | |
123 | }; |