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libc: absolute minimum sscanf to get cc1 off the ground

This commit is contained in:
K. Lange 2018-10-12 13:51:26 +09:00
parent 5de060b1d5
commit 3975b9cd75
1 changed files with 19 additions and 2 deletions
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21
libc/stdio/scanf.c
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@ -5,7 +5,8 @@
extern char * _argv_0; extern char * _argv_0;
int vsscanf(const char *str, const char *format, va_list ap) { int vsscanf(const char *str, const char *format, va_list ap) {
fprintf(stderr, "%s: sscanf(..., format=%s, ...);\n", _argv_0, format); fprintf(stderr, "%s: sscanf(\"%s\", format=\"%s\", ...);\n", _argv_0, str, format);
int count = 0;
while (*format) { while (*format) {
if (*format == ' ') { if (*format == ' ') {
/* handle white space */ /* handle white space */
@ -14,12 +15,28 @@ int vsscanf(const char *str, const char *format, va_list ap) {
} }
} else if (*format == '%') { } else if (*format == '%') {
/* Parse */ /* Parse */
format++;
if (*format == 'd') {
int i = 0;
while (*str && *str > '0' && *str < '9') {
i = i * 10 + *str - '0';
str++;
}
int * out = (int *)va_arg(ap, int*);
fprintf(stderr, "%s: sscanf: out %d\n", _argv_0, i);
count++;
*out = i;
}
} else { } else {
/* Expect exact character? */ /* Expect exact character? */
if (*str == *format) {
str++;
}
} }
format++; format++;
} }
return 0; return count;
} }
int vfscanf(FILE * stream, const char *format, va_list ap) { int vfscanf(FILE * stream, const char *format, va_list ap) {