100 lines
1.7 KiB
C
100 lines
1.7 KiB
C
|
/* expand - expand tabs to spaces Author: Terrence W. Holm */
|
||
|
|
|
||
|
|
/* Usage: expand [ -tab1,tab2,tab3,... ] [ file ... ] */
|
||
|
|
|
||
|
|
#include <stddef.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
#define MAX_TABS 32
|
||
|
|
|
||
|
|
int column = 0; /* Current column, retained between files */
|
||
|
|
|
||
|
|
_PROTOTYPE(int main, (int argc, char **argv));
|
||
|
|
_PROTOTYPE(void Expand, (FILE *f, int tab_index, int tabs []));
|
||
|
|
|
||
|
|
int main(argc, argv)
|
||
|
|
int argc;
|
||
|
|
char *argv[];
|
||
|
|
{
|
||
|
|
int tabs[MAX_TABS];
|
||
|
|
int tab_index = 0; /* Default one tab */
|
||
|
|
int i;
|
||
|
|
FILE *f;
|
||
|
|
|
||
|
|
tabs[0] = 8; /* Default tab stop */
|
||
|
|
|
||
|
|
if (argc > 1 && argv[1][0] == '-') {
|
||
|
|
char *p = argv[1];
|
||
|
|
int last_tab_stop = 0;
|
||
|
|
|
||
|
|
for (tab_index = 0; tab_index < MAX_TABS; ++tab_index) {
|
||
|
|
if ((tabs[tab_index] = atoi(p + 1)) <= last_tab_stop) {
|
||
|
|
fprintf(stderr, "Bad tab stop spec\n");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
last_tab_stop = tabs[tab_index];
|
||
|
|
|
||
|
|
if ((p = strchr(p + 1, ',')) == NULL) break;
|
||
|
|
}
|
||
|
|
|
||
|
|
--argc;
|
||
|
|
++argv;
|
||
|
|
}
|
||
|
|
if (argc == 1)
|
||
|
|
Expand(stdin, tab_index, tabs);
|
||
|
|
else
|
||
|
|
for (i = 1; i < argc; ++i) {
|
||
|
|
if ((f = fopen(argv[i], "r")) == NULL) {
|
||
|
|
perror(argv[i]);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
Expand(f, tab_index, tabs);
|
||
|
|
fclose(f);
|
||
|
|
}
|
||
|
|
|
||
|
|
return(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void Expand(f, tab_index, tabs)
|
||
|
|
FILE *f;
|
||
|
|
int tab_index;
|
||
|
|
int tabs[];
|
||
|
|
{
|
||
|
|
int next;
|
||
|
|
int c;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
while ((c = getc(f)) != EOF) {
|
||
|
|
if (c == '\t') {
|
||
|
|
if (tab_index == 0)
|
||
|
|
next = (column / tabs[0] + 1) * tabs[0];
|
||
|
|
else {
|
||
|
|
for (i = 0; i <= tab_index && tabs[i] <= column; ++i);
|
||
|
|
|
||
|
|
if (i > tab_index)
|
||
|
|
next = column + 1;
|
||
|
|
else
|
||
|
|
next = tabs[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
do {
|
||
|
|
++column;
|
||
|
|
putchar(' ');
|
||
|
|
} while (column < next);
|
||
|
|
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (c == '\b')
|
||
|
|
column = column > 0 ? column - 1 : 0;
|
||
|
|
else if (c == '\n' || c == '\r')
|
||
|
|
column = 0;
|
||
|
|
else
|
||
|
|
++column;
|
||
|
|
|
||
|
|
putchar(c);
|
||
|
|
}
|
||
|
|
}
|