[PATCH 2/4] Implement cmdutils.c:read_file().

[Stefano Sabatini]

---
 cmdutils.c |   23 +++++++++++++++++++++++
 cmdutils.h |   11 +++++++++++
 2 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/cmdutils.c b/cmdutils.c
index 1ffe2e8..f561316 100644
--- a/cmdutils.c
+++ b/cmdutils.c
@@ -639,3 +639,26 @@ int read_yesno(void)
 
     return yesno;
 }
+
+int read_file(const char *filename, char **bufptr, int *size)
+{
+    FILE *f = fopen(filename, "r");
+
+    if (!f) {
+        fprintf(stderr, "Cannot read file '%s': %s\n", filename, strerror(errno));
+        return AVERROR(errno);
+    }
+    fseek(f, 0, SEEK_END);
+    *size = ftell(f) + 1;
+    fseek(f, 0, SEEK_SET);
+    *bufptr = av_malloc(*size);
+    if (!*bufptr) {
+        fprintf(stderr, "Could not allocate file buffer\n");
+        return AVERROR(ENOMEM);
+    }
+    fread(*bufptr, 1, *size-1, f);
+    fclose(f);
+    (*bufptr)[*size-1] = '\0';
+
+    return 0;
+}
diff --git a/cmdutils.h b/cmdutils.h
index 9190a81..6d12a97 100644
--- a/cmdutils.h
+++ b/cmdutils.h
@@ -200,4 +200,15 @@ void show_pix_fmts(void);
  */
 int read_yesno(void);
 
+/**
+ * Reads the file with name filename, and puts its content in a newly
+ * allocated 0-terminated buffer.
+ *
+ * @param bufptr puts here the pointer to the newly allocated buffer
+ * @param size puts here the size of the newly allocated buffer
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR error code in case of failure.
+ */
+int read_file(const char *filename, char **bufptr, int *size);
+
 #endif /* FFMPEG_CMDUTILS_H */
-- 
1.7.0


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