diff options
| -rw-r--r-- | src/monetary/strfmon.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/src/monetary/strfmon.c b/src/monetary/strfmon.c index 0b8d73f5..cf88a9ba 100644 --- a/src/monetary/strfmon.c +++ b/src/monetary/strfmon.c @@ -1,7 +1,96 @@ #include <monetary.h> +#include <ctype.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> ssize_t strfmon(char * restrict s, size_t maxsize, const char * restrict format, ...) { + size_t i = 0; + va_list ap; + va_start(ap, format); + + while (*format && i < maxsize) { + if (*format != '%') { + s[i++] = *format++; + continue; + } + + format++; + + if (*format == '%') { + s[i++] = '%'; + format++; + continue; + } + + char fill = ' '; + char style = '+'; + int grouping = 1; + int symbol = 1; + enum { left, right } align = right; + + switch (*format) { + case '=': + fill = format[1]; + format += 2; + break; + case '^': + grouping = 0; + format++; + break; + case '+': + case '(': + style = *format; + format++; + break; + case '!': + symbol = 0; + format++; + break; + case '-': + align = left; + format++; + break; + } + + unsigned long width = 0; + if (isdigit(*format)) { + char *end = NULL; + width = strtoul(format, &end, 10); + format = end + 1; + } + + if (*format == '#') { + /* TODO: left precision */ + } + + if (*format == '.') { + /* TODO: right precision */ + } + + if (*format == 'i') { + /* international format */ + double value = va_arg(ap, double); + i += snprintf(s + i, maxsize - i, "USD %.2g", value); + format++; + continue; + } + + if (*format == 'n') { + /* national format */ + double value = va_arg(ap, double); + i += snprintf(s + i, maxsize - i, "$%.2g", value); + format++; + continue; + } + + va_end(ap); + return -1; + } + + va_end(ap); + return i; } /* |