59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
#include <stdio.h>
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#define MAXLINE 1000 /* maximum characters in a line */
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#define TABWIDTH 4 /* tab size */
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int my_getline(char line[], int maxline);
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void entab(char to[], char from[]);
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main()
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{
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int len; /* current line length */
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char line[MAXLINE]; /* current input line */
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char entab_line[MAXLINE]; /* detabbed line */
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while ((len = my_getline(line, MAXLINE)) > 0) {
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entab(entab_line, line);
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printf("%s", entab_line);
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}
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return 0;
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}
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/* my_getline: reads in a line, return the length */
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int my_getline(char line[], int lim)
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{
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int c, i;
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for (i = 0; i < lim-1 && (c=getchar()) != EOF && c != '\n'; ++i)
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line[i] = c;
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if (c == '\n') {
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line[i] = c;
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++i;
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}
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line[i] = '\0';
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return i;
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}
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/* entab: replace blanks with tab in line; does not handle the limit */
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void entab(char to[], char from[])
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{
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int i, j, k;
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i = j = k = 0;
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while ((to[j] = from[i]) != '\0') {
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if (from[i] == ' ') {
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++k;
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if (k == TABWIDTH) {
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k = 0;
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j = j - TABWIDTH;
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to[j] = '\t';
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}
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} else {
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k = 0;
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}
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++j;
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++i;
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}
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}
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