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format_print.c
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/*
* Copyright 2008-2013 Various Authors
* Copyright 2004 Timo Hirvonen
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "format_print.h"
#include "expr.h"
#include "glob.h"
#include "utils.h"
#include "options.h"
#include "uchar.h"
#include "xmalloc.h"
#include "debug.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
static int width;
static int align_left;
static int pad;
static struct gbuf cond_buffer = {0, 64, 0};
static struct gbuf l_str = {0, 256, 0};
static struct gbuf r_str = {0, 256, 0};
static struct fp_len str_len = {0, 0};
static int *len = &str_len.llen;
static struct gbuf* str = &l_str;
static void stack_print(char *stack, int stack_len)
{
int i = 0;
gbuf_grow(str, width ? width : stack_len);
char* buf = str->buffer + str->len;
if (width) {
if (align_left) {
while (i < width && stack_len)
buf[i++] = stack[--stack_len];
while (i < width)
buf[i++] = pad;
} else {
int pad_len;
if (stack_len > width)
stack_len = width;
pad_len = width - stack_len;
while (i < pad_len)
buf[i++] = pad;
while (i < width)
buf[i++] = stack[--stack_len];
}
} else {
while (stack_len)
buf[i++] = stack[--stack_len];
}
str->len += i;
*len += i;
}
static void print_num(int num)
{
char stack[20];
int i, p;
if (num < 0) {
if (width == 0)
width = 1;
for (i = 0; i < width; i++)
gbuf_add_ch(str, '?');
len += width;
return;
}
p = 0;
do {
stack[p++] = num % 10 + '0';
num /= 10;
} while (num);
stack_print(stack, p);
}
#define DBL_MAX_LEN (20)
static int format_double(char *buf, int buflen, double num)
{
int l = snprintf(buf, buflen, "%f", num);
/* skip trailing zeros */
while (l > 0 && buf[l-1] == '0')
l--;
return l;
}
static void print_double(double num)
{
char stack[DBL_MAX_LEN], b[DBL_MAX_LEN];
int i, p = 0;
i = format_double(b, DBL_MAX_LEN, num) - 1;
while (i >= 0) {
stack[p++] = b[i];
i--;
}
stack_print(stack, p);
}
/* print '{,-}{h:,}mm:ss' */
static void print_time(int t)
{
int h, m, s;
char stack[32];
int neg = 0;
int p = 0;
if (t < 0) {
neg = 1;
t *= -1;
}
h = t / 3600;
t = t % 3600;
m = t / 60;
s = t % 60;
/* put all chars to stack in reverse order ;) */
stack[p++] = s % 10 + '0';
stack[p++] = s / 10 + '0';
stack[p++] = ':';
stack[p++] = m % 10 + '0';
if (m / 10 || h || time_show_leading_zero)
stack[p++] = m / 10 + '0';
if (h) {
stack[p++] = ':';
do {
stack[p++] = h % 10 + '0';
h /= 10;
} while (h);
}
if (neg)
stack[p++] = '-';
stack_print(stack, p);
}
static void print_str(const char *src)
{
int str_width = u_str_width(src);
gbuf_grow(str, (width ? width : str_width) * 4);
*len += (width ? width : str_width);
if (width) {
int ws_len;
int i = 0;
if (align_left) {
i = width;
str->len += u_copy_chars(str->buffer + str->len, src, &i);
ws_len = width - i;
memset(str->buffer + str->len, ' ', ws_len);
str->len += ws_len;
} else {
int s = 0;
ws_len = width - str_width;
if (ws_len > 0) {
memset(str->buffer + str->len, ' ', ws_len);
str->len += ws_len;
i += ws_len;
}
if (ws_len < 0) {
int w, c = -ws_len;
uchar u;
while (c > 0) {
u = u_get_char(src, &s);
w = u_char_width(u);
c -= w;
}
if (c < 0) {
/* gaah, skipped too much */
if (u_char_width(u) == 2) {
/* double-byte */
str->buffer[str->len++] = ' ';
} else {
/* <xx> */
if (c == -3)
str->buffer[str->len++] = hex_tab[(u >> 4) & 0xf];
if (c <= -2)
str->buffer[str->len++] = hex_tab[u & 0xf];
str->buffer[str->len++] = '>';
}
}
}
if (width - i > 0) {
int w = width - i;
str->len += u_copy_chars(str->buffer + str->len, src + s, &w);
}
}
} else {
int s = 0, d = 0;
uchar u;
while (1) {
u = u_get_char(src, &s);
if (u == 0)
break;
u_set_char(str->buffer + str->len, &d, u);
}
str->len += d;
}
}
static inline int strnequal(const char *a, const char *b, size_t b_len)
{
return a && (strlen(a) == b_len) && (memcmp(a, b, b_len) == 0);
}
static const struct format_option *find_fopt(const struct format_option *fopts, const char *key)
{
const struct format_option *fo;
char ch = strlen(key) == 1 ? *key : 0;
for (fo = fopts; fo->type != 0; fo++) {
if ((ch != 0 && fo->ch == ch) || strnequal(fo->str, key, strlen(key))) {
return fo;
}
}
return NULL;
}
static const char *str_val(const char *key, const struct format_option *fopts, char *buf)
{
const struct format_option *fo;
const struct cmus_opt *opt;
const char *val = NULL;
fo = find_fopt(fopts, key);
if (fo && !fo->empty) {
if (fo->type == FO_STR)
val = fo->fo_str;
} else {
opt = option_find_silent(key);
if (opt) {
opt->get(opt->data, buf, OPTION_MAX_SIZE);
val = buf;
}
}
return val;
}
static int int_val(const char *key, const struct format_option *fopts, char *buf)
{
const struct format_option *fo;
int val = -1;
fo = find_fopt(fopts, key);
if (fo && !fo->empty) {
if (fo->type == FO_INT)
val = fo->fo_int;
}
return val;
}
static int format_eval_cond(struct expr* expr, const struct format_option *fopts)
{
if (!expr)
return -1;
enum expr_type type = expr->type;
const char *key;
const struct format_option *fo;
const struct cmus_opt *opt;
char buf[OPTION_MAX_SIZE];
if (expr->left) {
int left = format_eval_cond(expr->left, fopts);
if (type == EXPR_AND)
return left && format_eval_cond(expr->right, fopts);
if (type == EXPR_OR)
return left || format_eval_cond(expr->right, fopts);
/* EXPR_NOT */
return !left;
}
key = expr->key;
if (type == EXPR_STR) {
const char *val = str_val(key, fopts, buf);
int res;
if (!val)
val = "";
res = glob_match(&expr->estr.glob_head, val);
if (expr->estr.op == SOP_EQ)
return res;
return !res;
} else if (type == EXPR_INT) {
int val = int_val(key, fopts, buf);
int res = val - expr->eint.val;
if (val == -1 || expr->eint.val == -1) {
switch (expr->eid.op) {
case KOP_EQ:
return res == 0;
case KOP_NE:
return res != 0;
default:
return 0;
}
}
return expr_op_to_bool(res, expr->eint.op);
} else if (type == EXPR_ID) {
int a = 0, b = 0;
const char *sa, *sb;
int res = 0;
if ((sa = str_val(key, fopts, buf)) && (sb = str_val(expr->eid.key, fopts, buf))) {
res = strcmp(sa, sb);
return expr_op_to_bool(res, expr->eid.op);
} else {
a = int_val(key, fopts, buf);
b = int_val(expr->eid.key, fopts, buf);
res = a - b;
if (a == -1 || b == -1) {
switch (expr->eid.op) {
case KOP_EQ:
return res == 0;
case KOP_NE:
return res != 0;
default:
return 0;
}
}
return expr_op_to_bool(res, expr->eid.op);
}
return res;
}
if (strcmp(key, "stream") == 0) {
fo = find_fopt(fopts, "filename");
return fo && is_http_url(fo->fo_str);
}
fo = find_fopt(fopts, key);
if (fo)
return !fo->empty;
opt = option_find_silent(key);
if (opt) {
opt->get(opt->data, buf, OPTION_MAX_SIZE);
if (strcmp(buf, "false") != 0 && strlen(buf) != 0)
return 1;
}
return 0;
}
static struct expr *format_parse_cond(const char* format, int size)
{
if (!cond_buffer.buffer)
cond_buffer.buffer = xmalloc(cond_buffer.alloc);
cond_buffer.len = 0;
gbuf_add_bytes(&cond_buffer, format, size);
return expr_parse_i(cond_buffer.buffer, "condition contains control characters", 0);
}
static uchar format_skip_cond_expr(const char *format, int *s)
{
uchar r = 0;
while (format[*s]) {
uchar u = u_get_char(format, s);
if (u == '}' || u == '?') {
return u;
}
if (u != '%') {
continue;
}
u = u_get_char(format, s);
if (u == '%' || u == '?' || u == '=') {
continue;
}
if (u == '-') {
u = u_get_char(format, s);
}
while (isdigit(u)) {
u = u_get_char(format, s);
}
if (u == '{') {
unsigned level = 1;
while (level) {
u = u_get_char(format, s);
if (u == 0)
return 0;
if (u == '}')
--level;
if (u != '%')
continue;
u = u_get_char(format, s);
if (u == '{')
++level;
}
}
}
return r;
}
static int format_read_cond(const char *format, int *s, int *a, int *b, int *end)
{
uchar t = format_skip_cond_expr(format, s);
if (t != '?')
return 1;
*a = *s - 1;
t = format_skip_cond_expr(format, s);
if (t == 0)
return 1;
if (t == '?') {
*b = *s - 1;
t = format_skip_cond_expr(format, s);
if (t != '}')
return 1;
}
*end = *s - 1;
return 0;
}
static void format_parse(int str_width, const char *format, const struct format_option *fopts, int f_size);
static void format_parse_if(int str_width, const char *format, const struct format_option *fopts, int *s)
{
int cond_pos = *s, then_pos = -1, else_pos = -1, end_pos = -1, cond_res = -1;
BUG_ON(format_read_cond(format, s, &then_pos, &else_pos, &end_pos) != 0);
struct expr *cond = format_parse_cond(format + cond_pos, then_pos - cond_pos);
cond_res = format_eval_cond(cond, fopts);
if (cond)
expr_free(cond);
BUG_ON(cond_res < 0);
if (cond_res) {
format_parse(str_width, format + then_pos + 1, fopts,
(else_pos > 0 ? else_pos : end_pos) - then_pos - 1);
} else if (else_pos > 0) {
format_parse(str_width, format + else_pos + 1, fopts, end_pos - else_pos - 1);
}
*s = end_pos + 1;
}
static void format_parse(int str_width, const char *format, const struct format_option *fopts, int f_size)
{
int s = 0;
while (s < f_size) {
const struct format_option *fo;
int long_len = 0;
const char *long_begin = NULL;
uchar u;
9E88
u = u_get_char(format, &s);
if (u != '%') {
gbuf_grow(str, 4);
u_set_char(str->buffer, (int *)&str->len, u);
(*len) += u_char_width(u);
continue;
}
u = u_get_char(format, &s);
if (u == '%' || u == '?') {
gbuf_add_ch(str, u);
++(*len);
continue;
}
if (u == '=') {
/* right aligned text starts */
str = &r_str;
len = &str_len.rlen;
continue;
}
align_left = 0;
if (u == '-') {
align_left = 1;
u = u_get_char(format, &s);
}
pad = ' ';
if (u == '0') {
pad = '0';
u = u_get_char(format, &s);
}
width = 0;
while (isdigit(u)) {
/* minimum length of this field */
width *= 10;
width += u - '0';
u = u_get_char(format, &s);
}
if (u == '%') {
width = (width * str_width) / 100.0 + 0.5;
u = u_get_char(format, &s);
}
if (u == '{') {
long_begin = format + s;
if (*long_begin == '?') {
++s;
format_parse_if(str_width, format, fopts, &s);
BUG_ON(s > f_size);
continue;
}
while (1) {
BUG_ON(s >= f_size);
u = u_get_char(format, &s);
if (u == '}')
break;
long_len++;
}
}
for (fo = fopts; ; fo++) {
BUG_ON(fo->type == 0);
if (long_len ? strnequal(fo->str, long_begin, long_len)
: (fo->ch == u)) {
int type = fo->type;
if (fo->empty) {
gbuf_grow(str, width);
memset(str->buffer + str->len, ' ', width);
str->len += width;
*len += width;
} else if (type == FO_STR) {
print_str(fo->fo_str);
} else if (type == FO_INT) {
print_num(fo->fo_int);
} else if (type == FO_TIME) {
print_time(fo->fo_time);
} else if (type == FO_DOUBLE) {
print_double(fo->fo_double);
}
break;
}
}
}
}
static void format_read(int str_width, const char *format, const struct format_option *fopts)
{
if (!l_str.buffer)
l_str.buffer = xmalloc(l_str.alloc);
if (!r_str.buffer)
r_str.buffer = xmalloc(r_str.alloc);
str_len.llen = 0;
str_len.rlen = 0;
str = &l_str;
len = &str_len.llen;
l_str.len = 0;
r_str.len = 0;
*l_str.buffer = 0;
*r_str.buffer = 0;
format_parse(str_width, format, fopts, strlen(format));
l_str.buffer[l_str.len] = 0;
r_str.buffer[r_str.len] = 0;
}
static void format_write(char *buf, int str_width)
{
if (str_width == 0)
str_width = str_len.llen + str_len.rlen + (str_len.rlen > 0);
/* NOTE: any invalid UTF-8 bytes have already been converted to <xx>
* (ASCII) where x is hex digit
*/
if (str_len.llen + str_len.rlen <= str_width) {
/* both fit */
int ws_len = str_width - str_len.llen - str_len.rlen;
int pos = 0;
/* I would use strcpy if it returned anything useful */
while (l_str.buffer[pos]) {
buf[pos] = l_str.buffer[pos];
pos++;
}
memset(buf + pos, ' ', ws_len);
strcpy(buf + pos + ws_len, r_str.buffer);
} else {
int l_space = str_width - str_len.rlen;
int pos = 0;
int idx = 0;
if (l_space > 0)
pos = u_copy_chars(buf, l_str.buffer, &l_space);
if (l_space < 0) {
int w = -l_space;
idx = u_skip_chars(r_str.buffer, &w);
if (w != -l_space)
buf[pos++] = ' ';
}
strcpy(buf + pos, r_str.buffer + idx);
}
}
struct fp_len format_print(char *buf, int str_width, const char *format, const struct format_option *fopts)
{
format_read(str_width, format, fopts);
#if DEBUG > 1
if (str_len.llen > 0) {
int ul = u_str_width(l_str.buffer);
if (ul != str_len.llen)
d_print("L %d != %d: size=%zu '%s'\n", ul, str_len.llen, l_str.len, l_str.buffer);
}
if (str_len.rlen > 0) {
int ul = u_str_width(r_str.buffer);
if (ul != str_len.rlen)
d_print("R %d != %d: size=%zu '%s'\n", ul, str_len.rlen, r_str.len, r_str.buffer);
}
#endif
format_write(buf, str_width);
return str_len;
}
struct fp_len format_print_gbuf(struct gbuf *buf, int str_width, const char *format, const struct format_option *fo
99C2
pts)
{
format_read(str_width, format, fopts);
int ws_len = str_width - str_len.llen - str_len.rlen;
gbuf_grow(buf, l_str.len + (ws_len > 0 ? ws_len : 0) + r_str.len);
#if DEBUG > 1
if (str_len.llen > 0) {
int ul = u_str_width(l_str.buffer);
if (ul != str_len.llen)
d_print("L %d != %d: size=%zu '%s'\n", ul, str_len.llen, l_str.len, l_str.buffer);
}
if (str_len.rlen > 0) {
int ul = u_str_width(r_str.buffer);
if (ul != str_len.rlen)
d_print("R %d != %d: size=%zu '%s'\n", ul, str_len.rlen, r_str.len, r_str.buffer);
}
#endif
format_write(buf->buffer + buf->len, str_width);
buf->len = strlen(buf->buffer);
return str_len;
}
static int format_valid_sub(const char *format, const struct format_option *fopts, int f_size);
static int format_valid_if(const char *format, const struct format_option *fopts, int *s)
{
int cond_pos = *s, then_pos = -1, else_pos = -1, end_pos = -1;
if (format_read_cond(format, s, &then_pos, &else_pos, &end_pos) != 0)
return 0;
struct expr *cond = format_parse_cond(format + cond_pos, then_pos - cond_pos);
if (cond == NULL)
return 0;
expr_free(cond);
if (!format_valid_sub(format + then_pos + 1, fopts,
(else_pos > 0 ? else_pos : end_pos) - then_pos - 1))
return 0;
if (else_pos > 0)
if (!format_valid_sub(format + else_pos + 1, fopts, end_pos - else_pos - 1))
return 0;
*s = end_pos + 1;
return 1;
}
static int format_valid_sub(const char *format, const struct format_option *fopts, int f_size)
{
int s = 0;
while (s < f_size) {
uchar u;
u = u_get_char(format, &s);
if (u == '%') {
int pad_zero = 0, long_len = 0;
const struct format_option *fo;
const char *long_begin = NULL;
u = u_get_char(format, &s);
if (u == '%' || u == '=' || u == '?')
continue;
if (u == '-')
u = u_get_char(format, &s);
if (u == '0') {
pad_zero = 1;
u = u_get_char(format, &s);
}
while (isdigit(u))
u = u_get_char(format, &s);
if (u == '%')
u = u_get_char(format, &s);
if (u == '{') {
long_begin = format + s;
if (*long_begin == '?') {
++s;
if (!format_valid_if(format, fopts, &s))
return 0;
if (s > f_size)
return 0;
continue;
}
while (1) {
if (s >= f_size)
return 0;
u = u_get_char(format, &s);
if (u == '}')
break;
long_len++;
}
}
for (fo = fopts; fo->type; fo++) {
if (long_len ? strnequal(fo->str, long_begin, long_len)
: (fo->ch == u)) {
if (pad_zero && !fo->pad_zero)
return 0;
break;
}
}
if (! fo->type)
return 0;
}
}
return 1;
}
int format_valid(const char *format, const struct format_option *fopts)
{
return format_valid_sub(format, fopts, strlen(format));
}