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#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
__attribute__((format(printf, 2, 3)))
int wrap_printf(int indent, const char *format, ...)
{
static int columns, col;
va_list ap1, ap2;
int n;
const char *nl;
if (columns == 0) {
struct winsize ws = { };
ioctl(1, TIOCGWINSZ, &ws);
columns = ws.ws_col;
if (columns <= 0)
columns = 80;
}
va_start(ap1, format);
va_copy(ap2, ap1);
n = vsnprintf(NULL, 0, format, ap1);
va_end(ap1);
if (col + n > columns) {
putchar('\n');
if (*format == '\n')
format++;
col = 0;
}
if (col == 0) {
while (*format == ' ')
format++;
col += indent;
while (indent--)
putchar(' ');
}
n = vprintf(format, ap2);
va_end(ap2);
if (n > 0)
col += n;
nl = strrchr(format, '\n');
if (nl && nl[1] == 0)
col = 0;
return n;
}
int wrap_printf_wordwise(int indent, const char *str)
{
int n = 0;
do {
const char *fmt = "%.*s", *s;
int m;
if (*str == ' ') {
fmt = " %.*s";
while (*str == ' ')
str++;
}
for (s = str; *s && *s != ' '; s++)
/* nothing */ ;
m = wrap_printf(indent, fmt, s - str, str);
if (m < 0)
return m;
n += m;
str = s;
} while (*str);
return n;
}
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