52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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int main() {
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FILE *fp; // file pointer
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float *data; // data pointer (array of floats)
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int i, file_size, arr_size;
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char filename[2049];
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printf("Enter filename to read: ");
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scanf("%2048s", filename);
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fp = fopen(filename, "rb");
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if (fp == NULL) {
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printf("Failed to open file\n");
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return 1;
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}
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// get file size (technically isn't the best way because SEEK_END is undefined behaviour:
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//
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// "Library implementations are allowed to not meaningfully support SEEK_END
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// (therefore, code using it has no real standard portability)."
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// ~ https://cplusplus.com/reference/cstdio/fseek/
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//
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// " Setting the file position indicator to end-of-file, as with fseek(file, 0, SEEK_END),
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// has undefined behavior for a binary stream (because of possible trailing null characters) or
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// for any stream with state-dependent encoding that does not assuredly end in the initial shift
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// state. "
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// ~ https://port70.net/~nsz/c/c11/n1570.html#note268
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//
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// it is also limited to 2GB files as it returns a signed integer
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// better to use something like this probably:
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// https://stackoverflow.com/a/238609
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//
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// but louise uses fseek so i will too
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fseek(fp, 0, SEEK_END);
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file_size = ftell(fp);
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arr_size = file_size/sizeof(float);
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rewind(fp);
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// allocate memory and read data
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data = malloc(file_size);
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fread(data, sizeof(float), arr_size, fp);
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for (i = 0; i < arr_size; i++) {
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printf("%d %0.3f\n", i, data[i]);
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}
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free(data);
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}
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