49 lines
968 B
C
49 lines
968 B
C
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#include <stdio.h>
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#include <stdlib.h>
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#define TABSTOP 4
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void detab(int tabstop);
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int fill(int indent, int tabstop);
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/* detab input, takes one optional argument for tabstop width */
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int main(int argc, char *argv[])
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{
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int tabstop;
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if (argc < 2 || !(tabstop = atoi(argv[1])))
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detab(TABSTOP);
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else
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detab(tabstop);
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return 0;
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}
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/* detabs input with spaces, tab stop width is 'tabstop' */
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void detab(int tabstop)
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{
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int c, indent = 0; /* indent starts at 0 */
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while ((c = getchar()) != EOF)
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if (c == '\t')
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indent = fill(indent, tabstop);
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else {
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putchar(c);
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indent = (c == '\n') ? 0 : indent + 1;
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}
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}
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/* fills output with spaces from indent to next tabstop */
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/* returns new indent */
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int fill(int indent, int tabstop)
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{
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int w = tabstop - indent % tabstop;
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for (; w > 0; --w) {
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putchar(' ');
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++indent;
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}
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return indent;
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}
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