interpolate.c - pointtools - Simple point utilities to hold text presentations.
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       ---
       interpolate.c (1587B)
       ---
            1 #include <stdlib.h>
            2 #include <stdio.h>
            3 #include <string.h>
            4 #include <unistd.h>
            5 
            6 #define STEPS 32
            7 
            8 /* SLEEPTIME in microseconds */
            9 #define SLEEPTIME 100
           10 
           11 int
           12 main(int argc, char *argv[])
           13 {
           14         FILE *from, *to;
           15         int i, j, k;
           16         int width, height;
           17         int fromn, ton;
           18         size_t linesize;
           19         ssize_t r;
           20         char **fromlines, **tolines, *line;
           21         char fromc, toc;
           22 
           23         if (argc < 3)
           24                 return 1;
           25 
           26         if (!(from = fopen(argv[1], "r")))
           27                 return 1;
           28 
           29         if (!(to = fopen(argv[2], "r")))
           30                 return 1;
           31 
           32         line = NULL;
           33         linesize = 0;
           34         width = 0;
           35 
           36         fromn = 0;
           37         fromlines = NULL;
           38         while ((r = getline(&line, &linesize, from)) != -1) {
           39                 if (line[r-1] == '\n')
           40                         line[--r] = '\0';
           41                 fromn++;
           42                 fromlines = realloc(fromlines, fromn * sizeof(*fromlines));
           43                 fromlines[fromn-1] = strdup(line);
           44                 if (r > width)
           45                         width = r;
           46         }
           47         fclose(from);
           48 
           49         ton = 0;
           50         tolines = NULL;
           51         while ((r = getline(&line, &linesize, to)) != -1) {
           52                 if (line[r-1] == '\n')
           53                         line[--r] = '\0';
           54                 ton++;
           55                 tolines = realloc(tolines, ton * sizeof(*tolines));
           56                 tolines[ton-1] = strdup(line);
           57                 if (r > width)
           58                         width = r;
           59         }
           60         fclose(to);
           61 
           62         height = ton > fromn ? ton : fromn;
           63 
           64         printf("\033[2J");
           65         for (k = 0; k <= STEPS; k++) {
           66                 printf("\033[;H");
           67                 for (i = 0; i < height; i++) {
           68                         for (j = 0; j < width; j++) {
           69                                 fromc = ' ';
           70                                 toc = ' ';
           71                                 if (i < fromn && j < strlen(fromlines[i]))
           72                                         fromc = fromlines[i][j];
           73                                 if (i < ton && j < strlen(tolines[i]))
           74                                         toc = tolines[i][j];
           75                                 if (toc & 128)
           76                                         putchar(toc);
           77                                 else
           78                                         putchar(fromc + (toc - fromc) * k / STEPS);
           79                         }
           80                         putchar('\n');
           81                 }
           82                 usleep(SLEEPTIME);
           83         }
           84 
           85         return 0;
           86 }