From 2673cd637bf90777c396e5a1418405ee0e35249f Mon Sep 17 00:00:00 2001
From: Jan D''Orgeville <jdorgeville@gmail.com>
Date: Wed, 31 Oct 2018 00:10:35 -0400
Subject: [PATCH] add '.x' partial version support

---
 semver.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++---
 semver.h |  6 +++++
 2 files changed, 80 insertions(+), 3 deletions(-)

diff --git a/semver.c b/semver.c
index abb4b86..0b3ab9f 100644
--- a/semver.c
+++ b/semver.c
@@ -158,6 +158,62 @@ semver_parse (const char *str, semver_t *ver) {
   return res;
 }
 
+/**
+* Parses a string to retreived semver and operation string
+*
+* Returns:
+*
+* `0` - Parsed successfully
+* `-1` - In case of error
+*/
+int
+semver_parse_op(const char *str, semver_t *ver, char(*op)[3]) {
+  int valid, res;
+  size_t len;
+  char *buf;
+  char *head;
+  size_t i,j;
+
+  if (op == NULL) return -1;
+
+  len = strlen(str);
+  buf = (char*)calloc(len + 1, sizeof(*buf));
+  if (buf == NULL) return -1;
+  strcpy(buf, str);
+
+  head = buf;
+  j = 0;
+  for (i = 0; i < len; i++) {
+    const char c = buf[i];
+    if ((c >= '0' && c <= '9') || c == '.') continue; // number, keep buf untouched
+    if (c == 'x') {
+        buf[i] = '\0'; // remove 'x'
+        if (i > 0 && (buf[i-1] == '.')) buf[i-1] = '\0'; // remove also previous '.' if any
+        break;
+    }
+    if (j < 2) {
+        (*op)[j++] = c;
+        head = &(buf[i+1]); // move head to skip operation part
+    }
+  }
+  (*op)[j] = '\0';
+
+  valid = semver_is_valid(head);
+  if (!valid) {
+      free(buf);
+      return -1;
+  }
+
+  ver->metadata = parse_slice(head, MT_DELIMITER[0]);
+  ver->prerelease = parse_slice(head, PR_DELIMITER[0]);
+  res = semver_parse_version(head[0] == '\0' ? NULL : head, ver);
+  free(buf);
+#if DEBUG > 0
+  printf("[debug] semver.c %s = %d.%d.%d, %s %s\n", str, ver->major, ver->minor, ver->patch, ver->prerelease, ver->metadata);
+#endif
+  return res;
+}
+
 /**
  * Parses a given string as semver expression.
  *
@@ -175,6 +231,10 @@ semver_parse_version (const char *str, semver_t *ver) {
   slice = (char *) str;
   index = 0;
 
+  ver->major = 0; ver->is_major_set = 0;
+  ver->minor = 0; ver->is_minor_set = 0;
+  ver->patch = 0; ver->is_patch_set = 0;
+
   while (slice != NULL && index++ < 4) {
     next = strchr(slice, DELIMITER[0]);
     if (next == NULL)
@@ -188,9 +248,9 @@ semver_parse_version (const char *str, semver_t *ver) {
     if (endptr != next && *endptr != '\0') return -1;
 
     switch (index) {
-      case 1: ver->major = value; break;
-      case 2: ver->minor = value; break;
-      case 3: ver->patch = value; break;
+      case 1: ver->major = value; ver->is_major_set = 1; break;
+      case 2: ver->minor = value; ver->is_minor_set = 1; break;
+      case 3: ver->patch = value; ver->is_patch_set = 1; break;
     }
 
     /* Continue with the next slice */
@@ -452,6 +512,17 @@ semver_satisfies (semver_t x, semver_t y, const char *op) {
     return semver_lt(x, y);
   }
 
+  /* no op */
+  if (first == '\0') {
+      if (!y.is_major_set) return 1;
+      if (y.major != x.major) return 0;
+      if (!y.is_minor_set) return 1;
+      if (y.minor != x.minor) return 0;
+      if (!y.is_patch_set) return 1;
+      if (y.patch != x.patch) return 0;
+      return 1;
+  }
+
   return 0;
 }
 
diff --git a/semver.h b/semver.h
index 1b48670..9445e84 100644
--- a/semver.h
+++ b/semver.h
@@ -24,6 +24,9 @@ typedef struct semver_version_s {
   int major;
   int minor;
   int patch;
+  int is_major_set;
+  int is_minor_set;
+  int is_patch_set;
   char * metadata;
   char * prerelease;
 } semver_t;
@@ -71,6 +74,9 @@ semver_neq (semver_t x, semver_t y);
 int
 semver_parse (const char *str, semver_t *ver);
 
+int
+semver_parse_op(const char *str, semver_t *ver, char (*op)[3]);
+
 int
 semver_parse_version (const char *str, semver_t *ver);