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authorJim Meyering <jim@meyering.net>2004-07-08 14:01:49 +0000
committerJim Meyering <jim@meyering.net>2004-07-08 14:01:49 +0000
commit62e1d5259df82155ae52201678093381a35d898e (patch)
tree3c44b79aa1a11c84a8862d05d960873a83ae50c8 /src/printf.c
parent2aa1f2d16babc2b2b468fa503b757adf8e87336c (diff)
downloadcoreutils-62e1d5259df82155ae52201678093381a35d898e.tar.gz
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printf cleanup, to avoid undefined behavior, to add support for
formats that Bash supports, and to support wide integers like Bash does. (UNSPECIFIED): Remove. All uses now replaced by booleans, so that we don't reserve any values for precision or width (like Bash). (STRTOX): Use prototype, not K&R-style definition. (vstrtoimax): Renamed from xstrtol (to avoid confusion with xstrtol in ../lib), with type change to intmax_t. All uses changed. (vstrtoumax): Renamed from xstrtoul, with type change to uintmax_t. All uses changed. (vstrtod): Renamed from xstrtod. All uses changed. (print_direc): Use boolean arg instead of special value to indicate a missing precision or width. LENGTH no longer includes length modifiers or conversion character. New arg CONVERSION now specifies conversion character. Use intmax_t-width formatting for integers (like Bash). Add support for C99 %a, %A, %F (like Bash). Add support for field width with %c (POSIX requires this). Add a FIXME for lack of support for field width and precision for %b. Add support for '\'', '0' flags. Check for invalid combinations of flags, field width, precision, and conversion, to prevent use of undefined behavior. Allow multiple length modifiers, for formats like "%lld" (like Bash). Add support for C99 'j', 't', 'z' length modifiers (like Bash). In error message, output entire invalid conversion specification, instead of merely outputting % followed by the conversion char.
Diffstat (limited to 'src/printf.c')
-rw-r--r--src/printf.c268
1 files changed, 172 insertions, 96 deletions
diff --git a/src/printf.c b/src/printf.c
index bbd80edc5..7d0f68b10 100644
--- a/src/printf.c
+++ b/src/printf.c
@@ -67,9 +67,6 @@
(c) >= 'A' && (c) <= 'F' ? (c) - 'A' + 10 : (c) - '0')
#define octtobin(c) ((c) - '0')
-/* A value for field_width or precision that indicates it was not specified. */
-#define UNSPECIFIED INT_MIN
-
/* The value to return to the calling program. */
static int exit_status;
@@ -162,8 +159,7 @@ verify (const char *s, const char *end)
#define STRTOX(TYPE, FUNC_NAME, LIB_FUNC_EXPR) \
static TYPE \
-FUNC_NAME (s) \
- const char *s; \
+FUNC_NAME (char const *s) \
{ \
char *end; \
TYPE val; \
@@ -187,9 +183,9 @@ FUNC_NAME (s) \
return val; \
} \
-STRTOX (unsigned long int, xstrtoul, (strtoul (s, &end, 0)))
-STRTOX (long int, xstrtol, (strtol (s, &end, 0)))
-STRTOX (double, xstrtod, (c_strtod (s, &end)))
+STRTOX (intmax_t, vstrtoimax, (strtoimax (s, &end, 0)))
+STRTOX (uintmax_t, vstrtoumax, (strtoumax (s, &end, 0)))
+STRTOX (double, vstrtod, (c_strtod (s, &end)))
/* Output a single-character \ escape. */
@@ -317,97 +313,138 @@ print_esc_string (const char *str)
putchar (*str);
}
-/* Output a % directive. START is the start of the directive,
- LENGTH is its length, and ARGUMENT is its argument.
- If FIELD_WIDTH or PRECISION is UNSPECIFIED, they are args for
- '*' values in those fields. */
+/* Evaluate a printf conversion specification. START is the start of
+ the directive, LENGTH is its length, and CONVERSION specifies the
+ type of conversion. LENGTH does not include any length modifier or
+ the conversion specifier itself. FIELD_WIDTH and PRECISION are the
+ field width and precision for '*' values, if HAVE_FIELD_WIDTH and
+ HAVE_PRECISION are true, respectively. ARGUMENT is the argument to
+ be formatted. */
static void
-print_direc (const char *start, size_t length, int field_width,
- int precision, const char *argument)
+print_direc (const char *start, size_t length, char conversion,
+ bool have_field_width, int field_width,
+ bool have_precision, int precision,
+ char const *argument)
{
char *p; /* Null-terminated copy of % directive. */
- p = xmalloc ((unsigned) (length + 1));
- strncpy (p, start, length);
- p[length] = 0;
-
- switch (p[length - 1])
+ /* Create a null-terminated copy of the % directive, with an
+ intmax_t-wide length modifier substituted for any existing
+ integer length modifier. */
+ {
+ char *q;
+ size_t length_modifier_len;
+
+ switch (conversion)
+ {
+ case 'd': case 'i': case 'o': case 'u': case 'x': case 'X':
+ length_modifier_len = sizeof PRIdMAX - 2;
+ break;
+
+ default:
+ length_modifier_len = 0;
+ break;
+ }
+
+ p = xmalloc (length + length_modifier_len + 2);
+ q = mempcpy (p, start, length);
+ q = mempcpy (q, PRIdMAX, length_modifier_len);
+ *q++ = conversion;
+ *q = '\0';
+ }
+
+ switch (conversion)
{
case 'd':
case 'i':
- if (field_width == UNSPECIFIED)
- {
- if (precision == UNSPECIFIED)
- printf (p, xstrtol (argument));
- else
- printf (p, precision, xstrtol (argument));
- }
- else
- {
- if (precision == UNSPECIFIED)
- printf (p, field_width, xstrtol (argument));
- else
- printf (p, field_width, precision, xstrtol (argument));
- }
+ {
+ intmax_t arg = vstrtoimax (argument);
+ if (!have_field_width)
+ {
+ if (!have_precision)
+ printf (p, arg);
+ else
+ printf (p, precision, arg);
+ }
+ else
+ {
+ if (!have_precision)
+ printf (p, field_width, arg);
+ else
+ printf (p, field_width, precision, arg);
+ }
+ }
break;
case 'o':
case 'u':
case 'x':
case 'X':
- if (field_width == UNSPECIFIED)
- {
- if (precision == UNSPECIFIED)
- printf (p, xstrtoul (argument));
- else
- printf (p, precision, xstrtoul (argument));
- }
- else
- {
- if (precision == UNSPECIFIED)
- printf (p, field_width, xstrtoul (argument));
- else
- printf (p, field_width, precision, xstrtoul (argument));
- }
+ {
+ uintmax_t arg = vstrtoumax (argument);
+ if (!have_field_width)
+ {
+ if (!have_precision)
+ printf (p, arg);
+ else
+ printf (p, precision, arg);
+ }
+ else
+ {
+ if (!have_precision)
+ printf (p, field_width, arg);
+ else
+ printf (p, field_width, precision, arg);
+ }
+ }
break;
- case 'f':
+ case 'a':
+ case 'A':
case 'e':
case 'E':
+ case 'f':
+ case 'F':
case 'g':
case 'G':
- if (field_width == UNSPECIFIED)
- {
- if (precision == UNSPECIFIED)
- printf (p, xstrtod (argument));
- else
- printf (p, precision, xstrtod (argument));
- }
- else
- {
- if (precision == UNSPECIFIED)
- printf (p, field_width, xstrtod (argument));
- else
- printf (p, field_width, precision, xstrtod (argument));
- }
+ {
+ double arg = vstrtod (argument);
+ if (!have_field_width)
+ {
+ if (!have_precision)
+ printf (p, arg);
+ else
+ printf (p, precision, arg);
+ }
+ else
+ {
+ if (!have_precision)
+ printf (p, field_width, arg);
+ else
+ printf (p, field_width, precision, arg);
+ }
+ }
break;
case 'c':
- printf (p, *argument);
+ if (!have_field_width)
+ printf (p, *argument);
+ else
+ printf (p, field_width, *argument);
break;
case 's':
- if (field_width == UNSPECIFIED)
+ if (!have_field_width)
{
- if (precision == UNSPECIFIED)
+ if (!have_precision)
printf (p, argument);
else
printf (p, precision, argument);
}
else
{
- if (precision == UNSPECIFIED)
+ if (!have_precision)
printf (p, field_width, argument);
else
printf (p, field_width, precision, argument);
@@ -429,8 +466,11 @@ print_formatted (const char *format, int argc, char **argv)
const char *f; /* Pointer into `format'. */
const char *direc_start; /* Start of % directive. */
size_t direc_length; /* Length of % directive. */
- int field_width; /* Arg to first '*', or UNSPECIFIED if none. */
- int precision; /* Arg to second '*', or UNSPECIFIED if none. */
+ bool have_field_width; /* True if FIELD_WIDTH is valid. */
+ int field_width = 0; /* Arg to first '*'. */
+ bool have_precision; /* True if PRECISION is valid. */
+ int precision = 0; /* Arg to second '*'. */
+ char ok[UCHAR_MAX + 1]; /* ok['x'] is true if %x is allowed. */
for (f = format; *f; ++f)
{
@@ -439,7 +479,7 @@ print_formatted (const char *format, int argc, char **argv)
case '%':
direc_start = f++;
direc_length = 1;
- field_width = precision = UNSPECIFIED;
+ have_field_width = have_precision = false;
if (*f == '%')
{
putchar ('%');
@@ -447,6 +487,8 @@ print_formatted (const char *format, int argc, char **argv)
}
if (*f == 'b')
{
+ /* FIXME: Field width and precision are not supported
+ for %b, even though POSIX requires it. */
if (argc > 0)
{
print_esc_string (*argv);
@@ -455,19 +497,42 @@ print_formatted (const char *format, int argc, char **argv)
}
break;
}
- while (*f == ' ' || *f == '#' || *f == '+' || *f == '-')
- {
- ++f;
- ++direc_length;
- }
+
+ memset (ok, 0, sizeof ok);
+ ok['a'] = ok['A'] = ok['c'] = ok['d'] = ok['e'] = ok['E'] =
+ ok['f'] = ok['F'] = ok['g'] = ok['G'] = ok['i'] = ok['o'] =
+ ok['s'] = ok['u'] = ok['x'] = ok['X'] = 1;
+
+ for (;; f++, direc_length++)
+ switch (*f)
+ {
+ case '\'':
+ ok['a'] = ok['A'] = ok['c'] = ok['e'] = ok['E'] =
+ ok['o'] = ok['s'] = ok['x'] = ok['X'] = 0;
+ break;
+ case '-': case '+': case ' ':
+ break;
+ case '#':
+ ok['c'] = ok['d'] = ok['i'] = ok['s'] = ok['u'] = 0;
+ break;
+ case '0':
+ ok['c'] = ok['s'] = 0;
+ break;
+ default:
+ goto no_more_flag_characters;
+ }
+ no_more_flag_characters:;
+
if (*f == '*')
{
++f;
++direc_length;
if (argc > 0)
{
- field_width = xstrtoul (*argv);
- if (field_width == UNSPECIFIED)
+ intmax_t width = vstrtoimax (*argv);
+ if (INT_MIN <= width && width <= INT_MAX)
+ field_width = width;
+ else
error (EXIT_FAILURE, 0, _("invalid field width: %s"),
*argv);
++argv;
@@ -475,6 +540,7 @@ print_formatted (const char *format, int argc, char **argv)
}
else
field_width = 0;
+ have_field_width = true;
}
else
while (ISDIGIT (*f))
@@ -486,21 +552,32 @@ print_formatted (const char *format, int argc, char **argv)
{
++f;
++direc_length;
+ ok['c'] = 0;
if (*f == '*')
{
++f;
++direc_length;
if (argc > 0)
{
- precision = xstrtoul (*argv);
- if (precision == UNSPECIFIED)
+ intmax_t prec = vstrtoimax (*argv);
+ if (prec < 0)
+ {
+ /* A negative precision is taken as if the
+ precision were omitted, so -1 is safe
+ here even if prec < INT_MIN. */
+ precision = -1;
+ }
+ else if (INT_MAX < prec)
error (EXIT_FAILURE, 0, _("invalid precision: %s"),
*argv);
+ else
+ precision = prec;
++argv;
--argc;
}
else
precision = 0;
+ have_precision = true;
}
else
while (ISDIGIT (*f))
@@ -509,24 +586,23 @@ print_formatted (const char *format, int argc, char **argv)
++direc_length;
}
}
- if (*f == 'l' || *f == 'L' || *f == 'h')
- {
- ++f;
- ++direc_length;
- }
- if (! (*f && strchr ("diouxXfeEgGcs", *f)))
- error (EXIT_FAILURE, 0, _("%%%c: invalid directive"), *f);
- ++direc_length;
- if (argc > 0)
- {
- print_direc (direc_start, direc_length, field_width,
- precision, *argv);
- ++argv;
- --argc;
- }
- else
- print_direc (direc_start, direc_length, field_width,
- precision, "");
+
+ while (*f == 'l' || *f == 'L' || *f == 'h'
+ || *f == 'j' || *f == 't' || *f == 'z')
+ ++f;
+
+ {
+ unsigned char conversion = *f;
+ if (! ok[conversion])
+ error (EXIT_FAILURE, 0,
+ _("%.*s: invalid conversion specification"),
+ (int) (f + 1 - direc_start), direc_start);
+ }
+
+ print_direc (direc_start, direc_length, *f,
+ have_field_width, field_width,
+ have_precision, precision,
+ (argc <= 0 ? "" : (argc--, *argv++)));
break;
case '\\':