[Qemu-devel] [PATCH v2 1/5] s390-ccw: update libc

["Collin L. Walling" <walling@linux.vnet.ibm.com>]

Moved:
  memcmp from bootmap.h to libc.h (renamed from _memcmp)
  strlen from sclp.c to libc.h (renamed from _strlen)

Added C standard functions:
  isdigit
  atoi

Added non-C standard function:
  itostr

Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com>
---
 pc-bios/s390-ccw/Makefile  |  2 +-
 pc-bios/s390-ccw/bootmap.c |  4 +--
 pc-bios/s390-ccw/bootmap.h | 16 +---------
 pc-bios/s390-ccw/libc.c    | 75 ++++++++++++++++++++++++++++++++++++++++++++++
 pc-bios/s390-ccw/libc.h    | 31 +++++++++++++++++++
 pc-bios/s390-ccw/main.c    | 17 +----------
 pc-bios/s390-ccw/sclp.c    | 10 +------
 7 files changed, 112 insertions(+), 43 deletions(-)
 create mode 100644 pc-bios/s390-ccw/libc.c

diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile
index 6d0c2ee..9f7904f 100644
--- a/pc-bios/s390-ccw/Makefile
+++ b/pc-bios/s390-ccw/Makefile
@@ -9,7 +9,7 @@ $(call set-vpath, $(SRC_PATH)/pc-bios/s390-ccw)
 
 .PHONY : all clean build-all
 
-OBJECTS = start.o main.o bootmap.o sclp.o virtio.o virtio-scsi.o virtio-blkdev.o
+OBJECTS = start.o main.o bootmap.o sclp.o virtio.o virtio-scsi.o virtio-blkdev.o libc.o
 QEMU_CFLAGS := $(filter -W%, $(QEMU_CFLAGS))
 QEMU_CFLAGS += -ffreestanding -fno-delete-null-pointer-checks -msoft-float
 QEMU_CFLAGS += -march=z900 -fPIE -fno-strict-aliasing
diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c
index 67a6123..6f8e30f 100644
--- a/pc-bios/s390-ccw/bootmap.c
+++ b/pc-bios/s390-ccw/bootmap.c
@@ -512,7 +512,7 @@ static bool is_iso_bc_entry_compatible(IsoBcSection *s)
                     "Failed to read image sector 0");
 
     /* Checking bytes 8 - 32 for S390 Linux magic */
-    return !_memcmp(magic_sec + 8, linux_s390_magic, 24);
+    return !memcmp(magic_sec + 8, linux_s390_magic, 24);
 }
 
 /* Location of the current sector of the directory */
@@ -641,7 +641,7 @@ static uint32_t find_iso_bc(void)
         if (vd->type == VOL_DESC_TYPE_BOOT) {
             IsoVdElTorito *et = &vd->vd.boot;
 
-            if (!_memcmp(&et->el_torito[0], el_torito_magic, 32)) {
+            if (!memcmp(&et->el_torito[0], el_torito_magic, 32)) {
                 return bswap32(et->bc_offset);
             }
         }
diff --git a/pc-bios/s390-ccw/bootmap.h b/pc-bios/s390-ccw/bootmap.h
index cf99a4c..4980838 100644
--- a/pc-bios/s390-ccw/bootmap.h
+++ b/pc-bios/s390-ccw/bootmap.h
@@ -310,20 +310,6 @@ static inline bool magic_match(const void *data, const void *magic)
     return *((uint32_t *)data) == *((uint32_t *)magic);
 }
 
-static inline int _memcmp(const void *s1, const void *s2, size_t n)
-{
-    int i;
-    const uint8_t *p1 = s1, *p2 = s2;
-
-    for (i = 0; i < n; i++) {
-        if (p1[i] != p2[i]) {
-            return p1[i] > p2[i] ? 1 : -1;
-        }
-    }
-
-    return 0;
-}
-
 static inline uint32_t iso_733_to_u32(uint64_t x)
 {
     return (uint32_t)x;
@@ -416,7 +402,7 @@ const uint8_t vol_desc_magic[] = "CD001";
 
 static inline bool is_iso_vd_valid(IsoVolDesc *vd)
 {
-    return !_memcmp(&vd->ident[0], vol_desc_magic, 5) &&
+    return !memcmp(&vd->ident[0], vol_desc_magic, 5) &&
            vd->version == 0x1 &&
            vd->type <= VOL_DESC_TYPE_PARTITION;
 }
diff --git a/pc-bios/s390-ccw/libc.c b/pc-bios/s390-ccw/libc.c
new file mode 100644
index 0000000..60c4b28
--- /dev/null
+++ b/pc-bios/s390-ccw/libc.c
@@ -0,0 +1,75 @@
+/*
+ * libc-style definitions and functions
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include "libc.h"
+
+/**
+ * atoi:
+ * @str: the string to be converted.
+ *
+ * Given a string @str, convert it to an integer. Any non-numerical value
+ * will terminate the conversion.
+ *
+ * Returns: an integer converted from the string @str.
+ */
+int atoi(const char *str)
+{
+    int i;
+    int val = 0;
+
+    for (i = 0; str[i]; i++) {
+        char c = str[i];
+        if (!isdigit(c)) {
+            break;
+        }
+        val *= 10;
+        val += c - '0';
+    }
+
+    return val;
+}
+
+/**
+ * itostr:
+ * @num: the integer to be converted.
+ * @str: a pointer to a string to store the conversion.
+ * @len: the length of the passed string.
+ *
+ * Given an integer @num, convert it to a string. The string @str must be
+ * allocated beforehand. The resulting string will be null terminated and
+ * returned.
+ *
+ * Returns: the string @str of the converted integer @num.
+ */
+char *itostr(int num, char *str, size_t len)
+{
+    long num_len = 1;
+    int tmp = num;
+    int i;
+
+    /* Count length of num */
+    while ((tmp /= 10) > 0) {
+        num_len++;
+    }
+
+    /* Check if we have enough space for num and null */
+    if (len < num_len) {
+        return 0;
+    }
+
+    /* Convert int to string */
+    for (i = num_len - 1; i >= 0; i--) {
+        str[i] = num % 10 + '0';
+        num /= 10;
+    }
+
+    str[num_len] = '\0';
+
+    return str;
+}
diff --git a/pc-bios/s390-ccw/libc.h b/pc-bios/s390-ccw/libc.h
index 0142ea8..00268e3 100644
--- a/pc-bios/s390-ccw/libc.h
+++ b/pc-bios/s390-ccw/libc.h
@@ -42,4 +42,35 @@ static inline void *memcpy(void *s1, const void *s2, size_t n)
     return s1;
 }
 
+static inline int memcmp(const void *s1, const void *s2, size_t n)
+{
+    int i;
+    const uint8_t *p1 = s1, *p2 = s2;
+
+    for (i = 0; i < n; i++) {
+        if (p1[i] != p2[i]) {
+            return p1[i] > p2[i] ? 1 : -1;
+        }
+    }
+
+    return 0;
+}
+
+static inline size_t strlen(const char *str)
+{
+    size_t i;
+    for (i = 0; *str; i++) {
+        str++;
+    }
+    return i;
+}
+
+static inline int isdigit(int c)
+{
+    return (c >= '0') && (c <= '9');
+}
+
+int atoi(const char *str);
+char *itostr(int num, char *str, size_t len);
+
 #endif
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 401e9db..a8ef120 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -40,22 +40,7 @@ void panic(const char *string)
 
 unsigned int get_loadparm_index(void)
 {
-    const char *lp = loadparm;
-    int i;
-    unsigned int idx = 0;
-
-    for (i = 0; i < 8; i++) {
-        char c = lp[i];
-
-        if (c < '0' || c > '9') {
-            break;
-        }
-
-        idx *= 10;
-        idx += c - '0';
-    }
-
-    return idx;
+    return atoi(loadparm);
 }
 
 static bool find_dev(Schib *schib, int dev_no)
diff --git a/pc-bios/s390-ccw/sclp.c b/pc-bios/s390-ccw/sclp.c
index b1fc8ff..486fce1 100644
--- a/pc-bios/s390-ccw/sclp.c
+++ b/pc-bios/s390-ccw/sclp.c
@@ -65,14 +65,6 @@ void sclp_setup(void)
     sclp_set_write_mask();
 }
 
-static int _strlen(const char *str)
-{
-    int i;
-    for (i = 0; *str; i++)
-        str++;
-    return i;
-}
-
 long write(int fd, const void *str, size_t len)
 {
     WriteEventData *sccb = (void *)_sccb;
@@ -95,7 +87,7 @@ long write(int fd, const void *str, size_t len)
 
 void sclp_print(const char *str)
 {
-    write(1, str, _strlen(str));
+    write(1, str, strlen(str));
 }
 
 void sclp_get_loadparm_ascii(char *loadparm)
-- 
2.7.4