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printf: Output formatted data directly, instead of via asprintf.

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Long ago, sh used to have its own optimized and restricted string formatting
implementation, which the printf builtin had to bypass via asprintf() to a
temporary buffer. Since sh has used libc's string formatting implementation
for a long time, remove the workaround.

Add a check to keep  printf %c ''  working the same way (output nothing);
POSIX allows both outputting nothing and outputting a NUL byte.

Also, this change avoids silently discarding format directives for whose
output asprintf() cannot allocate memory.
This commit is contained in:
jilles 2017-04-29 21:48:11 +00:00
parent 0deadecfc3
commit 0b70e952ae
1 changed files with 6 additions and 10 deletions
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16
usr.bin/printf/printf.c
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@ -70,20 +70,15 @@ static const char rcsid[] =
#endif
#define PF(f, func) do { \
char *b = NULL; \
if (havewidth) \
if (haveprec) \
(void)asprintf(&b, f, fieldwidth, precision, func); \
(void)printf(f, fieldwidth, precision, func); \
else \
(void)asprintf(&b, f, fieldwidth, func); \
(void)printf(f, fieldwidth, func); \
else if (haveprec) \
(void)asprintf(&b, f, precision, func); \
(void)printf(f, precision, func); \
else \
(void)asprintf(&b, f, func); \
if (b) { \
(void)fputs(b, stdout); \
free(b); \
} \
(void)printf(f, func); \
} while (0)
static int asciicode(void);
@ -394,7 +389,8 @@ printf_doformat(char *fmt, int *rval)
char p;
p = getchr();
PF(start, p);
if (p != '\0')
PF(start, p);
break;
}
case 's': {