diff options
| -rw-r--r-- | man3/printf.3 | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/man3/printf.3 b/man3/printf.3 index bbb2f5b879..09f8e78b68 100644 --- a/man3/printf.3 +++ b/man3/printf.3 @@ -1025,6 +1025,9 @@ one might obtain "Sonntag, 3. Juli, 10:02". .PP To allocate a sufficiently large string and print into it (code correct for both glibc 2.0 and glibc 2.1): +.PP +If truncation occurs in glibc versions prior to 2.0.6, this is treated as an +error instead of being handled gracefully. .nf #include <stdio.h> @@ -1050,17 +1053,21 @@ make_message(const char *fmt, ...) n = vsnprintf(p, size, fmt, ap); va_end(ap); + /* Check error code */ + + if (n < 0) + return NULL; + /* If that worked, return the string. */ - if (n > \-1 && n < size) + if (n < size) return p; /* Else try again with more space. */ - if (n > \-1) /* glibc 2.1 */ + else size = n+1; /* precisely what is needed */ - else /* glibc 2.0 */ - size *= 2; /* twice the old size */ + if ((np = realloc (p, size)) == NULL) { free(p); |