38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
#include <stdio.h>
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int entab(char s[], int lim, int col) {
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int c, i, t;
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for (i=0,t=0; i < lim-1 && (c=getchar())!=EOF && c!='\n';i++,t++) {
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/*
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* c is the character representation as integer
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* i is the current column on the copied string
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* t is the current column on the original string
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*
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* t is used to count tab stops because i goes back when spaces are replaced by tabs.
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* i and t are both modified, however only i changes in contexts other than the routinal increase.
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* c is set to i's position and t is only used in tab stop counting
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*/
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if (t >= col && t%col == 0 && s[i-1] == ' ' && s[i-2] == ' ') {
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int x;
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for (x = i; s[x-1] == ' ' && i-col < x; x--);
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s[x] = '\t';
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i = ++x;
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}
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s[i] = c;
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}
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if (c == '\n')
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/*
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* If it is the end of the string, represented by a new line,
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* add that new line and increase it for the \0 addition
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*/ {
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s[i] = c;
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}
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/*Add the string end and return it to the previous context*/
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if (lim-1 > i) {
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s[i+1] = '\0';
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} else {
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s[lim-1] = '\0';
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}
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return i;
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}
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