README,INSTALL: Fix some spelling errors.

[paraslash.git] / string.c

diff --git a/string.c b/string.c
index 60050ad7afaf822acd6883c08c222808ce1bbeab..78d54f67fd992f099f287233184343f912a05941 100644 (file)
--- a/string.c
+++ b/string.c
@@ -548,3 +548,64 @@ __printf_2_3 int para_printf(struct para_buffer *b, const char *fmt, ...)
        }
        return ret;
 }
+
+#ifndef LLONG_MAX
+#define LLONG_MAX (1 << (sizeof(long) - 1))
+#endif
+#ifndef LLONG_MIN
+#define LLONG_MIN (-LLONG_MAX - 1LL)
+#endif
+
+/**
+ * Convert a string to a 64-bit signed integer value.
+ *
+ * \param str The string to be converted.
+ * \param value Result pointer.
+ *
+ * \return Positive on success, negative on errors.
+ *
+ * \sa para_atoi32(), strtol(3), atoi(3).
+ */
+int para_atoi64(const char *str, int64_t *value)
+{
+       char *endptr;
+       long long tmp;
+
+       errno = 0; /* To distinguish success/failure after call */
+       tmp = strtoll(str, &endptr, 10);
+       if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN))
+               return -E_ATOI_OVERFLOW;
+       if (errno != 0 && tmp == 0) /* other error */
+               return -E_STRTOLL;
+       if (endptr == str)
+               return -E_ATOI_NO_DIGITS;
+       if (*endptr != '\0') /* Further characters after number */
+               return -E_ATOI_JUNK_AT_END;
+       *value = tmp;
+       return 1;
+}
+
+/**
+ * Convert a string to a 32-bit signed integer value.
+ *
+ * \param str The string to be converted.
+ * \param value Result pointer.
+ *
+ * \return Positive on success, negative on errors.
+ *
+ * \sa para_atoi64().
+*/
+int para_atoi32(const char *str, int32_t *value)
+{
+       int64_t tmp;
+       int ret;
+       const int32_t max = 2147483647;
+
+       ret = para_atoi64(str, &tmp);
+       if (ret < 0)
+               return ret;
+       if (tmp > max || tmp < -max - 1)
+               return -E_ATOI_OVERFLOW;
+       *value = tmp;
+       return 1;
+}