platform.c: provide getline implementation

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 34 insertions, 0 deletions

diff --git a/include/platform.h b/include/platform.h
index cbe85f469..eafc3fcfe 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -350,6 +350,7 @@ typedef unsigned smalluint;
 #define HAVE_STRSIGNAL 1
 #define HAVE_STRVERSCMP 1
 #define HAVE_VASPRINTF 1
+#define HAVE_GETLINE 1
 #define HAVE_XTABS 1
 #define HAVE_MNTENT_H 1
 #define HAVE_NET_ETHERNET_H 1
@@ -470,4 +471,8 @@ extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
 extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
 #endif
 
+#ifndef HAVE_GETLINE
+extern ssize_t getline(char **lineptr, size_t *n, FILE *stream) FAST_FUNC;
+#endif
+
 #endif
diff --git a/libbb/platform.c b/libbb/platform.c
index 04b8961de..2bf34f5bc 100644
--- a/libbb/platform.c
+++ b/libbb/platform.c
@@ -145,3 +145,32 @@ char* FAST_FUNC stpcpy(char *p, const char *to_add)
         return p;
 }
 #endif
+
+#ifndef HAVE_GETLINE
+ssize_t FAST_FUNC getline(char **lineptr, size_t *n, FILE *stream)
+{
+        int ch;
+        char *line = *lineptr;
+        size_t alloced = *n;
+        size_t len = 0;
+
+        do {
+                ch = fgetc(stream);
+                if (ch == EOF)
+                        break;
+                if (len + 1 >= alloced) {
+                        alloced += alloced/4 + 64;
+                        line = xrealloc(line, alloced);
+                }
+                line[len++] = ch;
+        } while (ch != '\n');
+
+        if (len == 0)
+                return -1;
+
+        line[len] = '\0';
+        *lineptr = line;
+        *n = alloced;
+        return len;
+}
+#endif