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Handle null characters in the format string. A \0 in the argument passed to %b

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still results in trucation but this is be much harder to fix.
This commit is contained in:
Stefan Farfeleder 2005-04-14 17:02:34 +00:00
parent fe8b8bf778
commit 3ec96caf72
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=145078
1 changed files with 13 additions and 7 deletions
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20
usr.bin/printf/printf.c
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@ -90,7 +90,7 @@ static const char rcsid[] =
static int asciicode(void);
static char *doformat(char *, int *);
static int escape(char *, int);
static int escape(char *, int, size_t *);
static int getchr(void);
static int getfloating(long double *, int);
static int getint(int *);
@ -109,6 +109,7 @@ progprintf(int argc, char *argv[])
main(int argc, char *argv[])
#endif
{
size_t len;
int ch, chopped, end, rval;
char *format, *fmt, *start;
@ -138,12 +139,13 @@ main(int argc, char *argv[])
* arguments, arguments of zero/null string are provided to use
* up the format string.
*/
chopped = escape(fmt = format = *argv, 1);/* backslash interpretation */
fmt = format = *argv;
chopped = escape(fmt, 1, &len); /* backslash interpretation */
rval = end = 0;
gargv = ++argv;
for (;;) {
start = fmt;
while (*fmt != '\0') {
while (fmt < format + len) {
if (fmt[0] == '%') {
fwrite(start, 1, fmt - start, stdout);
if (fmt[1] == '%') {
@ -246,6 +248,7 @@ doformat(char *start, int *rval)
*fmt = '\0';
switch (convch) {
case 'b': {
size_t len;
char *p;
int getout;
@ -258,7 +261,7 @@ doformat(char *start, int *rval)
warnx2("%s", strerror(ENOMEM), NULL);
return (NULL);
}
getout = escape(p, 0);
getout = escape(p, 0, &len);
*(fmt - 1) = 's';
PF(start, p);
*(fmt - 1) = 'b';
@ -356,12 +359,12 @@ mkquad(char *str, int ch)
}
static int
escape(char *fmt, int percent)
escape(char *fmt, int percent, size_t *len)
{
char *store;
char *save, *store;
int value, c;
for (store = fmt; (c = *fmt); ++fmt, ++store) {
for (save = store = fmt; (c = *fmt); ++fmt, ++store) {
if (c != '\\') {
*store = c;
continue;
@ -370,6 +373,7 @@ escape(char *fmt, int percent)
case '\0': /* EOS, user error */
*store = '\\';
*++store = '\0';
*len = store - save;
return (0);
case '\\': /* backslash */
case '\'': /* single quote */
@ -383,6 +387,7 @@ escape(char *fmt, int percent)
break;
case 'c':
*store = '\0';
*len = store - save;
return (1);
case 'f': /* form-feed */
*store = '\f';
@ -420,6 +425,7 @@ escape(char *fmt, int percent)
}
}
*store = '\0';
*len = store - save;
return (0);
}