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authorManuel Novoa III <mjn3@codepoet.org>2001-01-27 23:50:02 +0000
committerManuel Novoa III <mjn3@codepoet.org>2001-01-27 23:50:02 +0000
commitfdfb85cbcaae9dc06e6576235f120fdcf8f88066 (patch)
tree292fb0df74cf3ca718798b9434bd49bce75f48c8 /libc/stdio/printf.c
parent8b15b45ecc58d84f9d4a6bd91fc0675b446103b8 (diff)
Fixed (hopefully) 0-pad bug in printf. Added asprintf function. Reworked
the *s*printf functions to no longer use a static fake file.
Diffstat (limited to 'libc/stdio/printf.c')
-rw-r--r--libc/stdio/printf.c100
1 files changed, 70 insertions, 30 deletions
diff --git a/libc/stdio/printf.c b/libc/stdio/printf.c
index c1271d72d..8d62278ff 100644
--- a/libc/stdio/printf.c
+++ b/libc/stdio/printf.c
@@ -56,6 +56,18 @@
* Modified sprintf, snprintf, vsprintf, vsnprintf to share on fake-file.
*/
+/*
+ * Manuel Novoa III Jan 2000
+ *
+ * Removed fake file from *s*printf functions because of possible problems
+ * if called recursively. Instead, have sprintf, snprintf, and vsprintf
+ * call vsnprintf which allocates a fake file on the stack.
+ *
+ * Added asprintf.
+ *
+ * Hopefully fixed 0-pad prefixing bug.
+ */
+
/*****************************************************************************/
/* OPTIONS */
/*****************************************************************************/
@@ -90,6 +102,8 @@
/*
* Use fputc instead of macro putc. Slower but saves about 36 bytes.
+ * WARNING! This may cause problems the the *s*printf functions!
+ * Don't enable at this time. Manuel
*/
#define WANT_FPUTC 0
@@ -124,15 +138,6 @@
extern int vfnprintf(FILE * op, size_t max_size,
register __const char *fmt, register va_list ap);
-extern FILE __sprintf_fake_file[1];
-
-#ifdef L__sprintf_fake_file
-FILE __sprintf_fake_file[1] = {
- {0, 0, (char *) (unsigned) -1, 0, (char *) (unsigned) -1, -1,
- _IOFBF | __MODE_WRITE}
-};
-#endif
-
#ifdef L_printf
int printf(const char *fmt, ...)
{
@@ -146,6 +151,34 @@ int printf(const char *fmt, ...)
}
#endif
+#ifdef L_asprintf
+int asprintf(char **app, const char *fmt, ...)
+{
+ va_list ptr;
+ int rv, i;
+ char *p; /* unitialized warning is ok here */
+ /*
+ * First iteration - find out size of buffer required and allocate it.
+ * Second iteration - actually produce output.
+ */
+ rv = 0;
+ for (i=0 ; i<2 ; i++) {
+ va_strt(ptr, fmt);
+ rv = vsnprintf(p, rv, fmt, ptr);
+ va_end(ptr);
+
+ if (i==0) { /* first time through so */
+ p = malloc(++rv); /* allocate the buffer */
+ *app = p;
+ if (!p) {
+ return -1;
+ }
+ }
+ }
+ return rv;
+}
+#endif
+
#ifdef L_sprintf
int sprintf(char *sp, const char *fmt, ...)
{
@@ -153,10 +186,8 @@ int sprintf(char *sp, const char *fmt, ...)
int rv;
va_strt(ptr, fmt);
- __sprintf_fake_file->bufpos = sp;
- rv = vfnprintf(__sprintf_fake_file, -1, fmt, ptr);
+ rv = vsnprintf(sp, -1, fmt, ptr);
va_end(ptr);
- *(__sprintf_fake_file->bufpos) = 0;
return rv;
}
#endif
@@ -169,10 +200,8 @@ int snprintf(char *sp, size_t size, const char *fmt, ...)
int rv;
va_strt(ptr, fmt);
- __sprintf_fake_file->bufpos = sp;
- rv = vfnprintf(__sprintf_fake_file, size, fmt, ptr);
+ rv = vsnprintf(sp, size, fmt, ptr);
va_end(ptr);
- *(__sprintf_fake_file->bufpos) = 0;
return rv;
}
#endif
@@ -200,12 +229,7 @@ int vprintf(const char *fmt, va_list ap)
#ifdef L_vsprintf
int vsprintf(char *sp, __const char *fmt, va_list ap)
{
- int rv;
-
- __sprintf_fake_file->bufpos = sp;
- rv = vfnprintf(__sprintf_fake_file, -1, fmt, ap);
- *(__sprintf_fake_file->bufpos) = 0;
- return rv;
+ return vsnprintf(sp, -1, fmt, ap);
}
#endif
@@ -213,10 +237,23 @@ int vsprintf(char *sp, __const char *fmt, va_list ap)
int vsnprintf(char *sp, size_t size, __const char *fmt, va_list ap)
{
int rv;
+#if 0
+ FILE f = {0, 0, (char *) (unsigned) -1, 0, (char *) (unsigned) -1, -1,
+ _IOFBF | __MODE_WRITE};
+#else
+ /* As we're only using the putc macro in vfnprintf, we don't need to
+ initialize all FILE fields. */
+ FILE f;
+
+ f.bufwrite = (char *) (unsigned) -1;
+ f.bufpos = sp;
+ f.mode = _IOFBF | __MODE_WRITE;
+#endif
- __sprintf_fake_file->bufpos = sp;
- rv = vfnprintf(__sprintf_fake_file, size, fmt, ap);
- *(__sprintf_fake_file->bufpos) = 0;
+ rv = vfnprintf(&f, size, fmt, ap);
+ if (size) {
+ *(f.bufpos) = 0;
+ }
return rv;
}
#endif
@@ -523,7 +560,7 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
/* right padding || left padding */
if ((!len && !preci)
|| (width && !flag[FLAG_MINUS_LJUSTIFY])) {
- ch = ' ';
+ ch = flag[FLAG_0_PAD];
--width;
} else if (flag[FLAG_PLUS]) {
ch = flag[FLAG_PLUS]; /* sign */
@@ -533,12 +570,15 @@ int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
flag[FLAG_PLUS] = '\0';
}
--len;
- } else if (preci) {
- ch = '0';
- --preci;
} else {
- ch = *p++; /* main field */
- --len;
+ flag[FLAG_0_PAD]=' ';
+ if (preci) {
+ ch = '0';
+ --preci;
+ } else {
+ ch = *p++; /* main field */
+ --len;
+ }
}
if (++cnt < max_size) {